Search references for MECHANICAL WAVE. Phrases containing MECHANICAL WAVE
See searches and references containing MECHANICAL WAVE!MECHANICAL WAVE
Wave which is an oscillation of matter
In classical mechanics, a mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through an elastic material medium
Mechanical_wave
Dynamic disturbance in a medium or field
and electromagnetic waves. In a mechanical wave, stress and strain fields oscillate about a mechanical equilibrium. A mechanical wave is a local deformation
Wave
Vibration that travels via pressure waves in matter
material medium. In the context of physics, it is characterised as a mechanical wave of pressure or related quantities (e.g. displacement), whereas in
Sound
Mathematical description of quantum state
fundamentally differentiating it from classic mechanical waves. Wave functions are complex-valued. For example, a wave function might assign a complex number
Wave_function
Differential equation important in physics
The wave equation is a second-order linear partial differential equation for the description of waves or standing wave fields such as mechanical waves (e
Wave_equation
Physical phenomenon
physics, a surface wave is a mechanical wave that propagates along the interface between differing media. A common example is gravity waves along the surface
Surface_wave
Microelectromechanical sensor
into a mechanical wave which, unlike an electrical signal, can be easily influenced by physical phenomena. The device then transduces this wave back into
Surface_acoustic_wave_sensor
Spatial frequency of a wave
wave scattering, such as X-ray diffraction, neutron diffraction, electron diffraction, and elementary particle physics. For quantum mechanical waves,
Wavenumber
Vibrational energy transfer in Earth or other planetary body
A seismic wave is a mechanical wave of acoustic energy that travels through the Earth or another planetary body. It can result from an earthquake (or
Seismic_wave
Type of energy propagation
Acoustic waves are types of mechanical waves that propagate through matter—such as gas, liquid, and/or solids—by causing the particles of the medium to
Acoustic_wave
Branch of physics involving mechanical waves
Acoustics is a branch of continuum mechanics that deals with the study of mechanical waves in gases, liquids, and solids including topics such as vibration, sound
Acoustics
Tendency of a mechanical system
the Millennium Bridge Various method of inducing mechanical resonance in a medium exist. Mechanical waves can be generated in a medium by subjecting an electromechanical
Mechanical_resonance
Physical quantity
rotational kinetic and potential energy within a system is referred to as mechanical energy, whereas nuclear energy refers to the combined potentials within
Energy
Snail-shaped part of inner ear involved in hearing
membrane is a mechanically somewhat stiff membrane, supporting the receptor organ for hearing, the organ of Corti, and determines the mechanical wave propagation
Cochlea
Wave that remains in a constant position
In physics, a standing wave, also known as a stationary wave, is a wave that oscillates in time but whose peak amplitude profile does not move in space
Standing_wave
Quantum mechanical waves describing matter
matter waves. Schrödinger applied Hamilton's optico-mechanical analogy to develop his wave mechanics for subatomic particles. Consequently, wave solutions
Matter_wave
Describes the range of energies of an electron within the solid
derives these bands and band gaps by examining the allowed quantum mechanical wave functions for an electron in a large, periodic lattice of atoms or
Electronic_band_structure
Physical phenomenon relating to the direction of waves
but other waves such as sound waves and water waves also experience refraction. How much a wave is refracted is determined by the change in wave speed and
Refraction
the longitudinal direction and may be described as wave transmission of power, or mechanical wave transmission. – Gogu Constantinescu Later on the theory
Theory_of_sonics
Topics referred to by the same term
free dictionary. Sound is an audible mechanical wave propagating through matter, or the perception of such waves by the brain. Sound or Sounds may also
Sound_(disambiguation)
Mechanical oscillations about an equilibrium point
of vibration to such systems. Vibrations propagate via mechanical waves and certain mechanical linkages conduct vibrations more efficiently than others
Vibration
Conceptual parallel between optics and classical mechanics
orthogonality of mechanical trajectories characteristic of geometrical optics to the optical wavefronts characteristic of a full wave equation, resulting
Hamilton's optical-mechanical analogy
Hamilton's_optical-mechanical_analogy
Mechanical transmission system with flexing
Strain wave gearing (also known as harmonic gearing) is a type of mechanical gear system that uses a flexible spline with external teeth, which is deformed
Strain_wave_gearing
Inertial waves, also known as inertial oscillations, are a type of mechanical wave possible in rotating fluids. Unlike surface gravity waves commonly
Inertial_wave
Relativistic quantum mechanical wave equation
In particle physics, the Dirac equation is a relativistic wave equation derived by British physicist Paul Dirac in 1928. In its free form, or including
Dirac_equation
Quantum field of electrons
in metallic crystals form due to the wave-like nature of electrons – a manifestation of quantum mechanical wave–particle duality – causing the electronic
Charge_density_wave
Quantum mechanical phenomenon
quantum tunnelling, barrier penetration, or simply tunnelling is a quantum mechanical phenomenon in which an object such as an electron or atom passes through
Quantum_tunnelling
Description of a quantum-mechanical system
partial differential equation that governs the wave function of a non-relativistic quantum-mechanical system. Its discovery was a significant landmark
Schrödinger_equation
Prevention of transmission of vibration
of vibration to such systems. Vibrations propagate via mechanical waves and certain mechanical linkages conduct vibrations more efficiently than others
Vibration_isolation
Measure of the size of atomic nuclei
atom, is actually a hazy quantum-mechanical wave-cloud, because each of the particles inside it are also hazy wave-clouds. Not having a definite surface
Charge_radius
Application of balanced forces which push inwards on an object
enlarges or increases in volume. In a mechanical wave, which is longitudinal, the medium is displaced in the wave's direction, resulting in areas of compression
Compression_(physics)
Moving wave that has oscillations perpendicular to the direction of the wave
a transverse wave is a wave that oscillates perpendicularly to the direction of the wave's advance. In contrast, a longitudinal wave travels in the
Transverse_wave
Series of waves generated by distant weather systems
ground swell, in the context of an ocean, sea or lake, is a series of mechanical waves that propagate along the interface between water and air under the
Swell_(wave)
Description of physical properties at the atomic and subatomic scale
Measurements of quantum systems show characteristics of both particles and waves (wave–particle duality), and there are limits to how accurately the value of
Quantum_mechanics
Scientific subjects
interference. Acoustics is the branch of physics involving the study of mechanical waves in different mediums. The study of the physical properties of matter
Branches_of_physics
Space of possible positions for all objects in a physical system
quantum-mechanical wave function has a complex phase; it is projective because the wave-function is normalized to unit probability. That is, given a wave-function
Configuration_space_(physics)
Type of wave
opposite) direction of the wave propagation. Mechanical longitudinal waves are also called compressional or compression waves, because they produce compression
Longitudinal_wave
Austrian physicist (1887–1961)
the Schrödinger equation, an equation that provides a way to calculate the wave function of a system and how it changes dynamically in time. He coined the
Erwin_Schrödinger
Time for a signal or other quantity to reach its destination
See also radio propagation, velocity factor, signal velocity and mechanical wave. Logic gates can have a gate delay ranging from picoseconds to more
Propagation_delay
Refractive property of materials
as a wave with field components in transverse polarization (perpendicular to the direction of the wave vector). A mathematical description of wave propagation
Birefringence
Number of occurrences or cycles per unit time
oscillatory and vibratory phenomena, such as mechanical vibrations, audio signals (sound), radio waves, and light. The interval of time between events
Frequency
Outermost layer of a physical object
occur at the interface of two phases Surface metrology Surface wave, a mechanical wave Atmospheric boundaries (tropopause, edge of space, plasmapause
Surface
Overview of and topical guide to energy
magnetic fields Mechanical energy – The sum of (usually macroscopic) kinetic and potential energies Mechanical wave – (≥0), a form of mechanical energy propagated
Outline_of_energy
and Minkowski that waves of a non-mechanical nature were conceived of and electromagnetic waves are no longer considered mechanical, therefore the experiment's
Fringe_shift
Topics referred to by the same term
1 ( z ) {\displaystyle \psi ^{1}(z)} and in physics to the quantum mechanical wave function. This disambiguation page lists mathematics articles associated
Psi_function
Obsolete postulated medium for the propagation of light
longitudinal, propagating like sound and other mechanical waves in fluids. However, longitudinal waves necessarily have only one form for a given propagation
Luminiferous_aether
Concept in quantum mechanics
bands. The experiment shows wave interference revealed a single particle at a time—quantum mechanical electrons display both wave and particle behavior. Similar
Wave–particle_duality
Conduit for signal propagation
requires a physical medium for transmission, as do other kinds of mechanical waves and heat energy. Historically, science incorporated various aether
Transmission_medium
Topological bound state of an electron
related phenomena in condensed-matter physics. Jain constructed quantum mechanical wave functions for composite fermions, which have been demonstrated to be
Composite_fermion
Velocity at which the overall shape of a wave's amplitudes propagates
velocity of a wave is the velocity with which the overall envelope shape of the wave's amplitudes—known as the modulation or envelope of the wave—propagates
Group_velocity
Removal of salts from water
resulted in extremely low energy rates. Wave powered desalination systems generally convert mechanical wave motion directly to hydraulic power for reverse
Desalination
1859 wave interference experiment
standby", attempted to demonstrate that mechanical waves undergo interference phenomena. In the experiment, mechanical waves traveled in opposite directions form
Melde's_experiment
Mathematical solution
between any two bounds always results in 0. D'Alembert operator Mechanical wave Wave equation D'Alembert (1747) "Recherches sur la courbe que forme une
D'Alembert's_formula
Hierarchical outline list of articles related to the physical sciences
as energy and force History of acoustics – history of the study of mechanical waves in solids, liquids, and gases (such as vibration and sound) History
Outline_of_physical_science
Quasiparticle of mechanical vibrations
scattering Fracton Linear elasticity Mechanical wave Phonon scattering Carrier scattering Phononic crystal Rayleigh wave Relativistic heat conduction Rigid
Phonon
Medical intervention
used for therapeutic purposes. It exploits low intensity and pulsed mechanical waves in order to induce regenerative and anti-inflammatory effects on biological
Low-intensity pulsed ultrasound
Low-intensity_pulsed_ultrasound
Aspect of relativity in physics
Gravitational waves are waves of spacetime curvature produced by the relative motion of gravitating masses and which propagate away at the speed of light
Gravitational_wave
micro-resonators. They refer to the phenomenon where energy is dissipated as mechanical waves from the resonator attenuate into the substrate. In physical systems
Anchor_losses
1998 album by Marilyn Manson
Mechanical Animals is the third studio album by American rock band Marilyn Manson. It was released on September 15, 1998, by Interscope Records. While
Mechanical_Animals
Electromagnetic frequencies ranging from 3 kHz to 300 GHz
current or voltage or of a magnetic, electric or electromagnetic field or mechanical system in the frequency range from around 20 kHz to around 300 GHz. These
Radio_frequency
Thin vibrating layer that produces sound
due to forces perpendicular to the membrane, leading to transverse mechanical waves. The frequency of oscillation depends on the elastic modulus, thickness
Acoustic_membrane
Longitudinal wave – Mechanical wave – Navier–Stokes equations – Partial differential equation – Periodic function – Permutation – Phase (waves) – Physics
List_of_cycles
Sensory perception of sound by living organisms
vertebrates, hearing is performed primarily by the auditory system: mechanical waves, known as vibrations, are detected by the ear and transduced into nerve
Hearing
Elementary particle with extremely low mass
flavor travel at slightly different speeds, so that their quantum mechanical wave packets develop relative phase shifts that change how they combine
Neutrino
nonlinear sound waves have now been shown to exist at lipid interfaces that show superficial similarity to action potentials (electro-opto-mechanical coupling
Soliton_model_in_neuroscience
Transport of energy by wind waves, and the capture of that energy to do useful work
ASME. The American Society of Mechanical Engineers. Retrieved April 11, 2026. "Ocean Wave Energy Extraction". dam-atoll-wave-energy.com. Leslie Spencer Wirt
Wave_power
Real numbers adjoined with a nil-squaring element
exclusion principle: under the exchange of coordinates, the quantum mechanical wave function changes sign, and thus vanishes if two coordinates are brought
Dual_number
Form of energy that can be heard by living things
Sound energy is the energy carried by longitudinal mechanical waves in elastic media. The energy is periodically converted between kinetic energy and elastic
Sound_energy
Electromagnetic radiation humans can see
visible or not. In this sense, gamma rays, X-rays, microwaves and radio waves are also light. This is why visible radiation is commonly termed visible
Light
History of the physical concept
to develop concepts and formulas that would allow them to describe the mechanical and thermal efficiencies of their systems. Engineers such as Sadi Carnot
History_of_energy
Point with minimum wave amplitude
chemistry, quantum-mechanical waves, or "orbitals", are used to describe the wave-like properties of electrons. Many of these quantum waves have nodes and
Node_(physics)
English mathematician, mathematical physicist (born 1931)
deterministic yet non-algorithmic processes may come into play in the quantum mechanical wave function reduction, and may be harnessed by the brain. He argues that
Roger_Penrose
Television that relies on a scanning device to display images
Mechanical television or mechanical scan television is an obsolete television system that relies on a mechanical scanning device, such as a rotating disk
Mechanical_television
Mathematical model of how solid objects deform
the study of elastic waves and involves linear elasticity with variation in time. An elastic wave is a type of mechanical wave that propagates in elastic
Linear_elasticity
Hull with fine bow with reduced reserve buoyancy
designs, and in diminished mechanical stress on the vessel. It also reduces a boat's wave-making resistance. The physics of wave-making resistance calls
Wave-piercing_hull
This is a list of wave topics. Contents: Top 0–9 A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Index_of_wave_articles
1978 EP by Devo
Mechanical Man is an EP by the American new wave band Devo, released in 1978 by Elevator Records. It includes four home demos by the band recorded before
Mechanical_Man_(EP)
ways of specifying this "central value". mechanical energy mechanical filter mechanical equilibrium mechanical wave mechanics The branch of science concerned
Glossary_of_physics
Schrödinger developed the equation that describes the behavior of a quantum-mechanical wave. The mathematical model, called the Schrödinger equation after its
History_of_quantum_mechanics
Physics demonstrations of light interference
in 1802. In these lectures, Young demonstrated interference of mechanical water waves using a ripple tank, consisting of a candle illuminating the bottom
Young's interference experiment
Young's_interference_experiment
Phenomenon resulting from the superposition of two waves
Instead, when waves of different polarization are added together, they give rise to a wave of a different polarization state. Quantum mechanically the theories
Wave_interference
Introductory article
function θ oscillates, it represents a new type of quantum-mechanical wave, and this new wave has its own momentum p = h/λ, which turns out to patch up
Introduction_to_gauge_theory
Predecessor to modern quantum mechanics (1900–1925)
short time later. In 1926 Erwin Schrödinger found a completely quantum mechanical wave-equation, which reproduced all the successes of the old quantum theory
Old_quantum_theory
Fundamental principle of physics
of the original wave function can be computed through the superposition principle this way. The projective nature of quantum-mechanical-state space causes
Superposition_principle
Equation for two-body bound states
probability conservation (similar to the normalization of the quantum mechanical wave function), which corresponds to the equation 2 P μ = Γ ¯ ( ∂ ∂ P μ
Bethe–Salpeter_equation
a longitudinal mechanical wave (acoustic wave) is transmitted through an elastic body, each material element, through which the wave has passed, oscillates
Sound_particle
Emulation of animal or human brain
core synaptic algorithm which has strong similarities to the quantum mechanical wave equation. EvBrain is a form of evolutionary software that can evolve
Artificial_brain
Quantized unit of magnetic flux
each point of the superconductor are described by the complex quantum mechanical wave function Ψ(r, t) – the superconducting order parameter. As with any
Magnetic_flux_quantum
Device for suppressing part of a signal
acoustic wave) filters are electromechanical devices commonly used in radio frequency applications. Electrical signals are converted to a mechanical wave in
Filter_(signal_processing)
Rate of change of acceleration with time
propagation of mechanical waves (or electromagnetic waves for a charged particle); therefore, for nonzero to high jerk, a shock wave and its propagation
Jerk_(physics)
List of definitions of terms and concepts related to civil engineering
equations measures of central tendency mechanical advantage mechanical engineering mechanical filter mechanical wave mechanics mechanism metal alloy mid-range
Glossary_of_civil_engineering
Topics referred to by the same term
chemical phenomena that occur at the interface of two phases Surface wave, a mechanical wave, in physics Interface (matter), common boundary among two different
Surface_(disambiguation)
Canadian philosopher and communications scholar (1911–1980)
"Heidegger surf-boards along on the electronic wave as triumphantly as Descartes rode the mechanical wave." Paul Levinson's 1999 book Digital McLuhan explores
Marshall_McLuhan
Recording of sound and playing it back
and reproduction is the electrical, mechanical, electronic, or digital inscription and re-creation of sound waves, such as spoken voice, singing, instrumental
Sound recording and reproduction
Sound_recording_and_reproduction
Destruction of objects by self-collapsing
McGraw-Hill. p. 129. ISBN 9780074600245. Archived from the original on 2017-03-21. Media related to Implosions at Wikimedia Commons Converging Shock Waves
Implosion (mechanical process)
Implosion_(mechanical_process)
Local pressure deviation caused by a sound wave
Thermoacoustic Sound Wave Generator driven with Waste Heat of Automobile Gasoline Engine". Transactions of the Japan Society of Mechanical Engineers B. 70
Sound_pressure
Particular solutions to the electromagnetic wave equation
Sinusoidal plane-wave solutions are particular solutions to the wave equation. The general solution of the electromagnetic wave equation in homogeneous
Sinusoidal plane-wave solutions of the electromagnetic wave equation
Sinusoidal_plane-wave_solutions_of_the_electromagnetic_wave_equation
Property of waves that can oscillate with more than one orientation
is a property of transverse waves which specifies the geometrical orientation of the oscillations. In a transverse wave, the direction of the oscillation
Polarization_(waves)
Near-field diffraction effect
{\textstyle z_{\text{T}}={\frac {2a^{2}}{\lambda }}} . Due to the quantum mechanical wave nature of particles, diffraction effects have also been observed with
Talbot_effect
Environmental effects on seismic waves
phenomenon (through mechanical waves) and details several research results on seismic site effects in Caracas. When propagating, the seismic waves are reflected
Seismic_site_effects
MECHANICAL WAVE
MECHANICAL WAVE
Boy/Male
Greek
Mechanical man made by Hephaestus.
Surname or Lastname
Northern Irish
Northern Irish : reduced form of Scottish McLean.English : perhaps a variant spelling of Lane.Finnish : ornamental name from laine ‘wave’. This is one of the most common names among those that were derived from words denoting natural features when hereditary surnames were adopted in Finland in the beginning of the 20th century. This name is found chiefly in southern Finland.French : metonymic occupational name for a worker or dealer in wool, from Old French la(i)ne ‘wool’ (Latin lana).
Girl/Female
Tamil
The wave
Girl/Female
Tamil
Saagarika | ஸாகரிகா
Wave, Born in the ocean, **
Saagarika | ஸாகரிகா
Girl/Female
Tamil
A wave
Girl/Female
Tamil
Sagarika | ஸாகரிகா
Wave, Born in the ocean
Sagarika | ஸாகரிகா
Surname or Lastname
Irish (co. Cork)
Irish (co. Cork) : reduced Anglicized form of Gaelic Mac Oitir ‘son of Oitir’, a personal name borrowed from Old Norse Óttarr, composed of the elements ótti ‘fear’, ‘dread’ + herr ‘army’.English : status name from Middle English cotter, a technical term in the feudal system for a serf or bond tenant who held a cottage by service rather than rent, from Old English cot ‘cottage’, ‘hut’ (see Coates) + -er agent suffix.Probably an Americanized spelling of German Kotter.
Girl/Female
Tamil
Nilormy | நீலோரà¯à®®à¯à®¯
Blue wave of sea
Nilormy | நீலோரà¯à®®à¯à®¯
Boy/Male
Tamil
Wave
Surname or Lastname
English
English : from Old Norse drengr ‘young man’, but with more than one possible interpretation. It may reflect the personal name (originally a byname) of this form, which had some currency in the most Scandinavian-influenced areas of medieval England. Alternatively it may reflect the Middle English borrowing of the vocabulary word in the sense ‘servant’, later a technical term of the feudal system of Northumbria for a free tenant who held land by military and agricultural service, sometimes paying rent as well or in commutation.
Surname or Lastname
English and Irish
English and Irish : apparently a topographic name from Middle English furlong ‘length of a field’ (from Old English furh ‘furrow’ + lang ‘long’), the technical term for the block of strips owned by several different persons which formed the unit of cultivation in the medieval open-field system of farming, or a habitational name from a minor place named with this word, such as Furlong in Devon or Shropshire. The surname is now chiefly common in Ireland, where a family of this name settled at the end of the 13th century.Possibly an Americanized form of French Ferland.
Surname or Lastname
English
English : occupational name for a keeper of a lodging house, Middle English innmann, from Old English inn ‘abode’, ‘lodging’ + mann ‘man’. Until recently there was in England a technical distinction between an inn, where lodgings were available as well as alcoholic beverages, and a tavern, which offered only the latter.
Girl/Female
Tamil
Large waves, Gurgling of water
Girl/Female
Tamil
Waves
Boy/Male
Latin
Yearning; sorrow. Abbreviation of Desiderus.Note: This Database is Copyright Dogwood Technical...
Girl/Female
Tamil
Wave
Surname or Lastname
English
English : nickname from Middle English, Old French hagard ‘wild’, ‘untamed’. This word was adopted into Middle English as a technical term in falconry to denote a hawk that had been captured and trained when already fully grown, rather than being reared in captivity; the surname may have developed as a metonymic occupational name for a falconer.Americanized form of Danish Ågård (see Agard).
Girl/Female
Tamil
Wave
Boy/Male
Tamil
Wave
Boy/Male
Hindu
Ocean, Sea, Stream, Wave
MECHANICAL WAVE
MECHANICAL WAVE
Female
Greek
 Feminine form of Greek Achim, probably ACHIMA means "Jehovah raises up." In use in Germany.
Male
African
born in the evening (or night).
Girl/Female
Tamil
Radharani | ராதாராநீÂ
Queen Radha, The beloved of Sri Krishna Bhagavan
Girl/Female
Hebrew
Innocent; Springtime.
Boy/Male
Finnish
Leaping warrior.
Boy/Male
Hindu
Palace, One of the three worlds
Male
Hindi/Indian
Variant spelling of Hindi Siddhartha, SIDDHARTA means "accomplished goal."
Boy/Male
English
Roofer.
Boy/Male
Bengali, Gujarati, Hindu, Indian, Kannada, Malayalam, Marathi, Oriya, Telugu
Fire
Girl/Female
Hindu, Indian, Jain, Marathi, Sanskrit, Tamil
Auspicious
MECHANICAL WAVE
MECHANICAL WAVE
MECHANICAL WAVE
MECHANICAL WAVE
MECHANICAL WAVE
a.
Pertaining to, connected with, or dependent upon, both mechanics and chemistry; -- said especially of those sciences which treat of such phenomena as seem to depend on the laws both of mechanics and chemistry, as electricity and magnetism.
a.
Obtained by trial, by measurements, etc.; approximate; empirical. See the 2d Note under Geometric.
a.
Not mechanical.
n.
A mechanic.
a.
Having to do with the application of the laws of motion in the art of constructing or making things; of or pertaining to mechanics; mechanical; as, the mechanic arts.
v. t.
To cause to become mechanical.
a.
Made and operated by interaction of forces without a directing intelligence; as, a mechanical universe.
a.
Pertaining to, governed by, or in accordance with, mechanics, or the laws of motion; pertaining to the quantitative relations of force and matter, as distinguished from mental, vital, chemical, etc.; as, mechanical principles; a mechanical theory; mechanical deposits.
n.
A mechanical lift. See Elevator.
a.
A mechanician; an artisan; an artificer; one who practices any mechanic art; one skilled or employed in shaping and uniting materials, as wood, metal, etc., into any kind of structure, machine, or other object, requiring the use of tools, or instruments.
n.
The state or quality of being mechanical.
a.
Technical.
adv.
In a mechanical manner.
n.
Mechanical operation or action.
v. t.
To cause to be mechanical.
a.
Hence: Mechanical; indifferent; listless; careless.
a.
Done as if by a machine; uninfluenced by will or emotion; proceeding automatically, or by habit, without special intention or reflection; as, mechanical singing; mechanical verses; mechanical service.
a.
Of or pertaining to a machine or to machinery or tools; made or formed by a machine or with tools; as, mechanical precision; mechanical products.
a.
Of or pertaining to the useful or mechanic arts, or to any science, business, or the like; specially appropriate to any art, science, or business; as, the words of an indictment must be technical.
a.
Of or pertaining to a mechanic or artificer, or to the class of artisans; hence, rude; common; vulgar.