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When an object takes in energy from sound waves instead of reflecting them
In acoustics, absorption refers to the process by which a material, structure, or object takes in sound energy when sound waves are encountered, as opposed
Absorption_(acoustics)
Topics referred to by the same term
the skin Absorption (pharmacology), absorption of drugs into the body Absorption (acoustics), absorption of sound waves by a material Absorption (electromagnetic
Absorption
Science and engineering of achieving a good sound within a building
interior space, although acoustical absorption may not be great. There are four ways to improve workplace acoustics and solve workplace sound problems:
Architectural_acoustics
Refrigerator that uses a heat source
An absorption refrigerator is a refrigerator that uses a heat source to provide the energy needed to drive the cooling process. Solar energy, burning oil
Absorption_refrigerator
Study of the propagation of sound in water
Underwater acoustics (also known as hydroacoustics) is the study of the propagation of sound in water and the interaction of the mechanical waves that
Underwater_acoustics
Sound-absorbing board
low-frequency absorption compared to panels mounted directly on a wall surface. Acoustics – Branch of physics involving mechanical waves Architectural acoustics –
Acoustic_panel
How sound behaves in an enclosed space
Room acoustics is a subfield of acoustics dealing with the behaviour of sound in enclosed or partially-enclosed spaces. The architectural details of a
Room_acoustics
Light or sound absorption in a substance
ultrasound attenuation, where it is denoted α and measured in dB⋅cm−1⋅MHz−1; acoustics for characterizing particle size distribution, where it is denoted α and
Attenuation_coefficient
Persistence of sound after it is produced
Room Acoustics (5th ed.). Spon Press. pp. 35–42. ISBN 978-0-415-48021-5. Acoustics — Sound absorbers for use in buildings — Rating of sound absorption (standard)
Reverberation
Branch of engineering dealing with sound and vibration
engineering dealing with sound and vibration. It includes the application of acoustics, the science of sound and vibration, in technology. Acoustical engineers
Acoustical_engineering
Audible vibration that travels via pressure waves in matter
Applications of acoustics are found in many areas of modern society. Subdisciplines include aeroacoustics, audio signal processing, architectural acoustics, bioacoustics
Sound
Acoustic sensing method
high (ultrasonic). The study of underwater sound is known as underwater acoustics or hydroacoustics. The first recorded use of the technique was in 1490
Sonar
Room designed to create diffuse sound
standard governing sound absorption measurements in reverberation rooms is ISO 354:2003 (Acoustics — Measurement of sound absorption in a reverberation room)
Reverberation_room
Unit of sound absorption
In acoustics, the sabin (or more precisely the square meter or foot sabin) is a unit of sound absorption, used for expressing the total effective absorption
Sabin_(unit)
Sound absorption performance of a material
for Sound Absorption and Sound Absorption Coefficients by the Reverberation Room Method". Intertek. "ASTM C423". Watson, Floyd (1941). Acoustics of Buildings
Noise_reduction_coefficient
Measure of energy loss as sound waves propagate through a medium
frame, with η {\displaystyle \eta } varying between 0.5 and 1.5. Absorption (acoustics) Fractional calculus Kirchhoff, G. (1868). "Ueber den Einfluss der
Acoustic_attenuation
Spreading of sound energy
Diffusion, in architectural acoustics, is the spreading of sound energy evenly in a given environment. A perfectly diffusive sound space is one in which
Diffusion_(acoustics)
Study of acoustic wave interactions with physical mediums
Longitudinal wave Love wave Nonlinear acoustics Picosecond ultrasonics Sonoluminescence Rayleigh wave Shear wave Sound absorption Sound velocity Thermoacoustics
Physical_acoustics
Damping unwanted vibrations of machinery
to deaden the transmission of noise through them. Noise absorption: In architectural acoustics, unwanted sounds can be absorbed rather than reflected inside
Acoustic_quieting
Methods to reduce sound pressure
of the sound waves, using damping structures such as sound baffles for absorption, or using active anti-noise sound generators. Acoustic quieting and noise
Soundproofing
Branch of physics and acoustics
Nonlinear acoustics (NLA) is a branch of physics and acoustics dealing with sound waves of sufficiently large amplitudes. Large amplitudes require using
Nonlinear_acoustics
Measurement of sound permeability
to 3 points. Though the terms sound absorption and damping are often interchangeable when discussing room acoustics, acousticians define these as two distinct
Sound_transmission_class
Absorber Absorption (acoustics) Absorption (electromagnetic radiation) Absorption band Absorption cross section Absorption curve Absorption edge Absorption refrigerator
Index_of_physics_articles_(A)
Acoustic panel or system of panels
] that some type of acoustic absorption product, such as acoustic foam, heavy curtains, acoustic panels, or absorption baffles be used on a significant
Drum_screen
American acoustic physicist (1868–1919)
relationship exists between the quality of the acoustics, the size of the chamber, and the amount of absorption surface present. He formally defined the reverberation
Wallace_Clement_Sabine
Type of energy propagation
The acoustic absorption, reflection and transmission in multilayer materials can be calculated with the transfer-matrix method. Acoustics Acoustic attenuation
Acoustic_wave
Sound dampening equipment
built to provide a critical listening environment. Like all acoustically absorptive devices, they function by turning sound energy into heat through friction
Bass_trap
Room designed to be completely echo free
outside in a free field. Anechoic chambers, a term coined by American acoustics expert Leo Beranek, were initially exclusively used to refer to acoustic
Anechoic_chamber
Phenomenon of air resonance in a cavity
the context of acoustics, Helmholtz resonance is instrumental in the design and analysis of musical instruments, architectural acoustics, and sound engineering
Helmholtz_resonance
The Variable Room Acoustics System (VRAS) is an acoustic enhancement system for controlling room acoustics electronically. Such systems are increasingly
VRAS
Machine that removes heat from a liquid coolant
liquid coolant via a vapor-compression, adsorption refrigeration, or absorption refrigeration cycles. This liquid can then be circulated through a heat
Chiller
Resonating sound wave in a closed room
Heinrich (2017). Room Acoustics (6th ed.). CRC Press. Everest, F. Alton; Pohlmann, Ken C. (2015). Master Handbook of Acoustics (6th ed.). McGraw-Hill
Room_modes
Nonlinear transduction mechanism
A parametric array, in the field of acoustics, is a nonlinear transduction mechanism that generates narrow, nearly side lobe-free beams of low frequency
Parametric_array
At which direct and reverberant sounds have equal pressure
Critical distance is, in acoustics, the distance at which the sound pressure level of the direct sound D and the reverberant sound R are equal when dealing
Critical_distance
British mathematician (1940–2026)
applied mathematician noted for his contributions to water waves and acoustics. Together with John Nicholas Newman, he initiated the International Workshop
David_Evans_(mathematician)
Sound insulation measure
Acoustics. Taylor & Francis. ISO 140 Acoustics — Measurement of sound insulation in buildings and of building elements: parts 1–14 ISO 717 Acoustics —
Sound_reduction_index
Transmission of sounds through and between materials
thermal technology, acoustics and daylighting. CERM. 2004 ISBN 80-214-2670-5 Acoustic absorption Acoustic attenuation Architectural acoustics Attenuation coefficient
Acoustic_transmission
Type of heat pump
An absorption-compression heat pump (ACHP) is a device that integrate an electric compressor in an absorption heat pump. In some cases this is obtained
Absorption-compression heat pump
Absorption-compression_heat_pump
Addition of sound to reduce distraction
(known as the 'ABC's' of architectural acoustics): A for Absorption – Sufficient (but not in excess) absorption in the developed environment. B for Blocking
Sound_masking
understanding of acoustical scattering, absorption and ambient noise, particularly in relation to the acoustics of bubbles in the sea. 2004 – D. Vance
ASA_Silver_Medal
British audio equipment manufacturer
(1925–1995). In 1992, the Hong Kong–based Gold Peak Group acquired KEF. And GP Acoustics, a member of Gold Peak, became the owner of the company. KEF continues
KEF
Harmonic phenomenon in music
Stanley; Tyrrell, John (eds.). "Acoustics". Grove Music Online. Oxford University Press. "Resonance, reverberation and absorption" section. Retrieved 17 August
Sympathetic_resonance
"Bouncing back" of waves at an interface
incident on the surface equals the angle at which it is reflected. In acoustics, reflection causes echoes and is used in sonar. In geology, it is important
Reflection_(physics)
Index of articles associated with the same name
communication, twisted pair systems (PTSN, Ethernet, etc.), optics and acoustics. Measures of TL are very important in the industry of acoustic devices
Transmission_loss
Absorption refrigerator invented in 1930
The Einstein–Szilard or Einstein refrigerator is an absorption refrigerator which has no moving parts, operates at constant pressure, and requires only
Einstein_refrigerator
Open-celled foam used for sound absorption
change a room's sound qualities by controlling residual sound through absorption. This purpose requires strategic placement of acoustic foam panels on
Acoustic_foam
Gradual loss of flux intensity through a medium
acoustic energy losses: absorption and scattering. Ultrasound propagation through homogeneous media is associated only with absorption and can be characterized
Attenuation
American acoustic engineer
total sound absorption, reverberation and the absorptive properties of materials while also innovating measurement, standards, and absorptive materials
Paul_Earls_Sabine
Range of physical processes in physics
interaction or scattering of solutions to partial differential equations. In acoustics, the differential equation is the wave equation, and scattering studies
Scattering
Gas layer surrounding Earth
"Part Two. Acoustic remote sensing for the upper atmosphere". Atmospheric Acoustics. pp. 297–308. doi:10.1515/9783110311532-012. ISBN 978-3-11-031153-2. Gadsden
Atmosphere_of_Earth
Room designated for formal teaching
effect upon the quality of the educational experience. Attention to the acoustics and colour scheme may reduce distractions and aid concentration. The lighting
Classroom
Concept relating to waves and signals
human eye. The wavelength of visible light ranges from 390 to 700 nm. The absorption spectrum of a chemical element or chemical compound is the spectrum of
Spectrum_(physical_sciences)
Mathematical models of heat pumps and refrigeration
vehicles. The absorption cycle is similar to the compression cycle, but depends on the partial pressure of the refrigerant vapor. In the absorption system,
Heat pump and refrigeration cycle
Heat_pump_and_refrigeration_cycle
Class of atmospheric infrasonic waves
In acoustics, microbaroms, also known as the "voice of the sea", are a class of atmospheric infrasonic waves generated in marine storms by a non-linear
Microbarom
German physicist
volumes 1907): Vol. 1: Allgemeine Physik und Akustik – General physics and acoustics. Vol. 2: Die Lehre von der Wärme – On heat. Vol. 3: Die Lehre vom Magnetismus
Adolf_Wüllner
Strategies to reduce noise pollution or its impact
Sound absorption: a porous material which acts as a 'noise sponge' by converting the sound energy into heat within the material. Common sound absorption materials
Noise_control
America (ASA) to individuals in recognition of outstanding contributions to acoustics. The Gold Medal was first presented in 1954 and is the highest award of
ASA_Gold_Medal
Sound transmission method
were researched almost 40 years earlier in the context of underwater acoustics. The first article consisted of a theoretical formulation of the half
Sound_from_ultrasound
Property in optics
ISBN 978-0-521-02997-1. Kinsler, Lawrence E. (2000). Fundamentals of Acoustics. John Wiley. p. 136. ISBN 978-0-471-84789-2. Young, Thomas (1807). A course
Refractive_index
Artificially created or enhanced sound
Zhao, Yuezhe, and Pan, Lili explained how sound absorption in the stage area influences the acoustics within an opera house auditorium. Their research
Sound_effect
Average distance travelled by a particle between impacts with other particles
4. This relation is used in the derivation of the Sabine equation in acoustics, using a geometrical approximation of sound propagation. In particle physics
Mean_free_path
Manufactured pieces for covering surfaces
little thermal insulation but are generally designed either to improve the acoustics of a room or to reduce the volume of air being heated or cooled. Mineral
Tile
William J. Cavanaugh, Gregory C. Tocci, Joseph A. Wilkes, Architectural Acoustics: Principles and Practice, Hoboken: John Wiley and Sons, Inc., 2010. 71
Akoustolith
Sound absorbent coating
plasters contained asbestos, but newer ones consist of a base layer of absorptive substrate panels, which are typically mineral wool, or a non-combustible
Acoustic_plaster
Study and modification of the noise and vibration characteristics of vehicles
noise is attenuated by isolation, while airborne noise is reduced by absorption or through the use of barrier materials. Vibrations are sensed at the
Noise, vibration, and harshness
Noise,_vibration,_and_harshness
– White noise Acoustic theory – Acoustics – Aerodynamics – Amplitude – Anemometer – Audio feedback – Beat (acoustics) – Bugging – Cherenkov radiation
List_of_cycles
Multiple diffraction of waves
of light with optical band-gap materials or related wave problems in acoustics. The sections below deal with dynamical diffraction of X-rays. The dynamical
Dynamical theory of diffraction
Dynamical_theory_of_diffraction
Electronic filter that is constructed with waveguide technology
interacting bandpass channel diplexers", IEE Journal on Microwaves, Optics and Acoustics, volume 1, issue 1, pages 34–40, September 1976. Rhodes, J. D.; Levy,
Waveguide_filter
Technology for transmitting signals through water
reflecting the short-to-medium range typical for practical voice underwater acoustics in real environments. The received signal is demodulated (decoded) into
Modulated_ultrasound
Quotient of a quantity by mass
the expression "per unit mass" is also often used. In some fields, like acoustics, "specific" can mean division by a quantity other than mass. Named and
Specific_quantity
Heating of air in buildings or vehicles
mass Thermodynamics Vapour pressure of water Technology Absorption-compression heat pump Absorption refrigerator Air barrier Air conditioning Antifreeze
Heating_system
physicist, specializing in various aspects of acoustics, especially sound generation, transmission and absorption. Academician of Chinese Academy of Sciences
Ma_Dayou
Electromagnetic radiation with a single constant frequency
rotational spectroscopy, to gamma rays, as in Mössbauer spectroscopy. Wave Acoustics Optics Monochromator Interferometer Diffraction grating Dichroic filter
Monochromatic_radiation
Physical phenomenon
or optoacoustic effect is the formation of sound waves following light absorption in a material sample. In order to obtain this effect the light intensity
Photoacoustic_effect
Secondary ceiling hung below a main ceiling
Theatre in London, England, built in 1596, had dropped ceilings to aid acoustics. U. S. Patent No. 1,470,728 for modern dropped ceilings was applied for
Dropped_ceiling
Air quality within and around buildings and structures
psychological aspects of life indoors (e.g., lighting, visual quality, acoustics, and thermal comfort). Indoor air pollution is a major health hazard in
Indoor_air_quality
German physicist and physiologist (1821–1894)
Rankine Scuderi Siemens Stirling Transcritical Vuilleumier Refrigeration Absorption Einstein Pulse tube Regenerative System properties Note: Conjugate variables
Hermann_von_Helmholtz
Device which reduces humidity
condensate into potable water. Desiccant dehumidifiers (known also as absorption dehumidifiers) bond moisture with hydrophilic materials such as silica
Dehumidifier
Treatment of air from kitchens
mass Thermodynamics Vapour pressure of water Technology Absorption-compression heat pump Absorption refrigerator Air barrier Air conditioning Antifreeze
Kitchen_ventilation
Registered trade name for halocarbon products
mass Thermodynamics Vapour pressure of water Technology Absorption-compression heat pump Absorption refrigerator Air barrier Air conditioning Antifreeze
Freon
Physical phenomenon relating to the direction of waves
vacuum (such as air, glass or water). This is not because of scattering or absorption. Rather it is because, as an electromagnetic oscillation, light itself
Refraction
Material used for thermal insulation
volume of open pores have been greatly regarded as an effective noise absorption material and are widely used as acoustic insulation in various sectors
Polyurethane_foam
System that transfers heat from one space to another
mass Thermodynamics Vapour pressure of water Technology Absorption-compression heat pump Absorption refrigerator Air barrier Air conditioning Antifreeze
Heat_pump
Portable heater
mass Thermodynamics Vapour pressure of water Technology Absorption-compression heat pump Absorption refrigerator Air barrier Air conditioning Antifreeze
Salamander_heater
Non-destructive type of ultrasonics
picosecond acoustics. When an ultrashort light pulse, known as the pump pulse, is focused onto a thin opaque film on a substrate, the optical absorption results
Picosecond_ultrasonics
Thermal engineering discipline concerning transfer of heat in physical systems
process by which long-wave (infrared) radiation is emitted to balance the absorption of short-wave (visible) energy from the Sun. The thermosphere (top of
Heat_transfer
Method of heat exchange in which convection drives pumpless circulation
mass Thermodynamics Vapour pressure of water Technology Absorption-compression heat pump Absorption refrigerator Air barrier Air conditioning Antifreeze
Thermosiphon
Device that removes contaminants from the air in a room
mass Thermodynamics Vapour pressure of water Technology Absorption-compression heat pump Absorption refrigerator Air barrier Air conditioning Antifreeze
Air_purifier
Device that changes direct current (DC) to alternating current (AC)
mass Thermodynamics Vapour pressure of water Technology Absorption-compression heat pump Absorption refrigerator Air barrier Air conditioning Antifreeze
Power_inverter
Phenomenon resulting from the superposition of two waves
word interference was used by Thomas Young in developing his theories of acoustics and optics. The principle of superposition of waves states that when two
Wave_interference
Numerical analysis technique for waves
plasma physics and ultrasonics. The method is implemented in open-source acoustics codes such as k-Wave and openPSTD. The main concepts behind PSTD can be
Pseudospectral time-domain method
Pseudospectral_time-domain_method
(population genetics) Fractional quantum Hall effect (physics) Franssen effect (acoustics) (sound perception) Franz–Keldysh effect (condensed matter) (electronic
List_of_effects
BBN Technologies from 1981 to 1988, and finally a principal engineer at Acoustics and Mechanics. From 1979 to 2004, Clifton was senior group vice president
Mark_A._Clifton
Component of air conditioning and refrigeration systems
mass Thermodynamics Vapour pressure of water Technology Absorption-compression heat pump Absorption refrigerator Air barrier Air conditioning Antifreeze
Thermal_expansion_valve
Liquid additive
mass Thermodynamics Vapour pressure of water Technology Absorption-compression heat pump Absorption refrigerator Air barrier Air conditioning Antifreeze
Antifreeze
Tank used in hot water systems
mass Thermodynamics Vapour pressure of water Technology Absorption-compression heat pump Absorption refrigerator Air barrier Air conditioning Antifreeze
Expansion_tank
cm line Abbe prism Absorption spectroscopy Absorption spectrum Absorption wavemeter Acoustic wave Acoustic wave equation Acoustics Acousto-optic effect
Index_of_wave_articles
Scientific study of buildings
the sound absorption of natural materials: Best-fit inverse laws for the acoustic impedance and the propagation constant". Applied Acoustics. 115: 131–138
Building_science
Indian physicist (1888–1970)
out independent research and where he made his major contributions in acoustics and optics. In 1917, he was appointed the first Palit Professor of Physics
C._V._Raman
17th century architecture located in Bijapur, Karnataka, India
the stature of the Adil Shahi dynasty, in light of the dynasty's later absorption by the Mughal Empire. The mausoleum is contained in a larger walled complex
Gol_Gumbaz
ABSORPTION ACOUSTICS
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ABSORPTION ACOUSTICS
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ABSORPTION ACOUSTICS
ABSORPTION ACOUSTICS