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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| M |
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| mechanical properties |
properties of a material that reveal the elastic
and inelastic reaction when force is applied, or that involve the relationship
between stress and strain; for example, the modulus of elasticity, tensile
strength, and fatigue limit. Compare physical properties. |
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| Meissner state |
thermodynamic state shown by all superconductors
in a sufficiently weak magnetic field, characterized by the exclusion or
expulsion of magnetic flux from everywhere within the superconductor except a
thin surface layer. |
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| melting |
change of state from solid to liquid caused by
absorption of heat |
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| melting point |
for a given pressure, the temperature at which
the solid and liquid phases of the substance are in equilibrium |
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| memory capacity |
amount of data that can be contained in a memory
storage device |
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| meniscus |
1.
free surface of a liquid which, near the walls of a vessel, is curved because
of surface tension. 2. in a manometer, the datum point measured at
the center of the free surface |
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| MEP |
mechanical, electrical, and plumbing |
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| met |
unit of metabolic rate of people. One met is
defined as 18.4 Btu/h·ft2 (58.15 W/m2), which is equal to
the energy produced per unit surface area of a seated person at rest. The
surface area of an average man is about 19 ft2 (1.8 m2 |
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| metabolism |
chemical changes in living cells by which energy
is provided for vital processes |
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| meter |
measuring device. Compare metre |
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