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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You can always search for terms. |
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| M |
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| mass |
quantity of matter in a body; measured in terms
of resistance to acceleration by a force, i.e., its inertia. In SI the standard
unit of mass is the kilogram (kg); in I-P it is the slug. Compare weight |
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| mass flow rate |
mass of a substance flowing per unit time |
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| mass transfer (mass transport) |
transfer of one component of a mixture, relative
to the motion of the mixture. It is the result of a concentration gradient.
Compare heat transfer |
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| materials inherently of low hazard |
all materials not hazardous by nature, existing
at near ambient pressure and temperature, and not placing at risk people working
on systems carrying such materials. |
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| matrix |
rectangular array of quantities in a prescribed
form |
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| MBtuh | deprecated I-P unit of power. One thousand Btu
per hour. In SI use watts or kilowatts |
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| mean tank temperature |
arithmetic mean of tank water temperatures
determined, using multiple thermocouples or other measuring devices. |
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| measurement |
1. act or result of determining the
characteristics of some thing.
2. extent, capacity, or amount ascertained by
measuring.
3. system of measures. |
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| meat keeper |
enclosed compartment or container which is
designed for the storage of fresh meat at or near 32°F (0°C). |
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| mechanical clearance |
free working space between two parts |
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