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| Absolute pressure
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Gauge pressure plus atmospheric pressure (14.7 lb.per sq.in.) equals absolute pressure. |
| Absolute scale
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Temperature scale using absolute zero as the zero point on the scale. |
| Absolute temperature
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Temperature measured from absolute zero. |
| Absolute zero temperature
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Temperature at which all molecular motion ceases (-460 F. and -273 C). |
| Absorb
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Fill or soak up. |
| Absorbent
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A material that extracts one or more substances from a fluid (gas or liquid) medium on contact, and which changes physically and/or chemically in the process. The less volatile of the two working fluids in an absorption cooling device. |
| Absorber
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The component of a solar thermal collector that absorbs solar radiation and converts it to heat, or, as in a solar photovoltaic device, the material that readily absorbs photons to generate charge carriers (free electrons or holes). |
| Absorption
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The act or process of retaining foreign particles such as gas or liquid without transmission of these particles. |
| Absorption chiller
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A type of air cooling device that uses absorption cooling to cool interior spaces. |
| Absorption coefficient
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In reference to a solar energy conversion devices, the degree to which a substance will absorb solar energy. In a solar photovoltaic device, the factor by which photons are absorbed as they travel a unit distance through a material. |
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