Glossary
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The terms and definitions included
in this glossary were taken from "ASHRAE Terminology of Heating, Ventilation,
Air Conditioning & Refrigeration".
To access the complete glossary please
visit ASHRAE's Bookstore.
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| sorbent |
material which
extracts one or more substances present in an atmosphere or mixture of gases or
liquids with which it is in contact, due to an affinity for such substances. sorption general term covering both
absorption and adsorption |
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| sound attenuation (noise reduction; soun |
process in which
sound energy is absorbed or otherwise diminished in intensity. |
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| sound decay rate | rate at which the sound
pressure level in an enclosed space decreases after the sound source has
stopped. It is measured in decibels per second |
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| sound insulation |
acoustical
treatment of constructions and equipment such as fan housings, supply ducts,
space enclosures, for isolation of vibration or to reduce transmitted noise. sound level magnitude of a sound or a
noise, usually determined by measuring the amplitude of variations in the sound
pressure expressed in decibels |
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| sound power level Lw |
airborne power
measured in decibels. It is the base 10 logarithm of the source power output w, multiplied by 10, and referenced at
10-12 W (1 pW). Or:
Lw = 10 log(w/10-12) = 10 log w + 120 dB |
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| sound pressure level Lp |
defined as Lp = 20 log p + 94 dB
where reference
pressure = 20 mPa |
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| space simulator |
device designed to
produce an environment close to actual space conditions. |
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| specific gravity |
ratio of the mass of a
given volume of a substance to the mass of an equal volume of water, usually at
4°C. Obsolete term. Use density |
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| specific heat |
ratio of the quantity of heat required to raise
the temperature of a given mass of any substance one degree to the quantity
required to raise the temperature of an equal mass of a standard substance one
degree [usually water at 59°F (15°C)]. |
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| specific humidity | ratio of the mass of water to the total mass of
a moist air sample |
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