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___ heat must be added or removed to cause a substance to change state between a solid and a liquid or a liquid and a gas.

Cold makeup water reduces overall boiler efficiency because energy is required to ___ the water.

Air pollutants are classified as primary pollutants and secondary pollutants.

The ASME Boiler and Pressure Vessel Code requires each automatically fired steam boiler to be protected from overpressure by ___ pressure-actuated control(s).

The ___ is a nongovernmental international organization that is comprised of national standards institutions of over 90 countries.

When a handwheel is turned to open a nonreturn valve, the stem retracts but the valve ___.

A ___ is a component of a refrigerant system that controls the flow of refrigerant into an evaporator.

The two types of pressure control are additive pressure control and subtractive pressure control.

Check valves are available as swing, lift, and spring check valves.

The ___ is a nongovernmental international organization that is comprised of national standards institutions of over 90 countries.