TM 9-4120-395-14&P
GLOSSARY
Ambient
Surrounding on all sides (environment).
A device used for Increasing the pressure of a gas or a vapor
Hermetically Sealed
Sealed airtight
Preventive Maintenance
Maintenance that Is performed on operational equipment to prevent equipment failure in
the future.
Refrigerant
A substance such as freon that by undergoing a change in phase (liquid to gas, gas to
liquid) releases or absorbs a large latent heat in relation to Its volume, and thus effects a
considerable cooling effect.
Thermostat
An instrument which measures changes in temperature and directly or indirectly controls
sources of heating and cooling to maintain a desired temperature.
Toxic
Poisonous.
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