Heat
Energy that causes molecules to be in motion and to raise the temperature of a substance.
Heat
Force per unit of area.
Pressure
Temperature
The amount of heat required to raise the temperature of 1lb of water 1 degree Fahrenheit.
British Thermal units.
Another word for heat transfer
Radiation
The absolute Fahrenheit scale with 0 at the point where all molecular motion stops.
Rankin scale
gauge used to measure the high pressure side of a system.
High side gauge.
A temperature scale where absolute 0 equals 0 or where molecular motion stops at 0. It has the same graduations per degree of change as the Celsius scale.
Kelvin scale
A device used to measure atmospheric pressure that is commonly calibrated in inches in millimeters of mercury.
Barometer
C-shaped tube manufactured of thin metal and closed on one end. when pressure is increased inside, it tends to straighten. It is used in a gauge to indicate pressure.
Bourdon tube
14.693
Standard atmospheric pressure
Heat energy absorbed or rejected when a substance is changing state and there is no change in temperature.
Latent heat (hidden heat)
The weight of the atmosphere's gases pressing down on earth. equal to 14.696 psi at sea level and 70 degrees Fahrenheit.
Atmospheric pressure
A gauge used to measure the pressure above and below the atmosphere's standard pressure. It is a bourdon tube sensing device and can be found on all gauge manifolds used for air conditioning and refrigeration service work.
Compound gauge.
The latent heat given off when refrigerant condenses.
Latent heat of condensation
Heat transfer from one place to another using a fluid.
Convection.
The temperature at which molecular motion stops (-460 degrees or equivalent)
Absolute zero temperature.
The movement of fluid by mechanical means.
Forced convection
The natural movement of a gas or fluid caused by differences in temperature.
Natural convection
Another term for temperature.
Heat intensity
The amount of heat energy required to change the state of a substance from a liquid to a solid or from a solid to liquid.
Latent heat of fusion
Heat that causes a change in temperature
Sensible heat
The amount of heat required to raise the temperature of 1lb of a substance 1 degree Fahrenheit.
Specific heat
heat transfer from one molecule to another within a substance or from one substance to another.
Conduction
The latent heat absorbed when refrigerant evaporates.
Latent heat of vaporization