Safety
The national law that covers workplace safety is the _____.
OSHA
The way a business interacts with customers is called ____.
customer relations
The lowest temperature possible.
Absolute zero
The amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit.
Sensible heat can be measured by a thermometer, while latent heat involves a change of state.
What is the saturation temperature?
The temperature at which liquid changes to vapor at a given pressure.
A stationary refrigerant detector indicates when _____.
refrigerant vapor level in the air is too high
Replacing a working blower fan with a new fan that is more energy efficient is an example of which type of service work?
Upgrade/system addition
What is superheat in the context of refrigerants?
The increase in temperature of a refrigerant vapor after it has changed from a liquid to a vapor.
What does subcooling refer to in refrigeration?
The reduction in temperature of a refrigerant liquid after it has changed from a vapor.
What occurs during the latent heat of condensation?
Heat is released from a vapor when changing to its liquid state.
Refillable refrigerant cylinders should not be filled more than _____.
80%
Define troubleshooting.
Analysis of a problem
Heat applied to an object that does not change its temperature.
Latent heat
What is the latent heat of fusion?
The heat absorbed or released when a liquid changes to or from a solid.
What is atmospheric pressure at sea level?
14.7 psi or 29.92 inHg.
A good method of preventing electrical hazards is to ____.
use a lockout/tagout (LOTO) practice
The initial setup of HVACR equipment and systems is ____ work.
installation
A substance's mass per unit of volume.
density
What is specific heat?
The amount of heat required to raise the temperature of one pound of a substance by one degree Fahrenheit.
Which term describes the total heat content (sensible and latent) of a refrigerant or other substance?
Enthalpy
Because many refrigerant vapors are heavier than air, a confined space must have ____.
good ventilation
A form of energy that results in the motion of atoms.
Heat
The total amount of heat in a substance.
Enthalpy
The ratio of mass of a certain volume of a liquid or solid compared to an equal volume of water.
Specific gravity
What is the definition of a British thermal unit (Btu)?
The amount of heat needed to raise the temperature of one pound of water by one degree Fahrenheit.