A(n) ___ prevents steam from entering the Bourdon tube of a pressure gauge.

The most common steam pressure gauge operates by the movement of a ___.

A check valve allows water to flow in one direction only.

The most common steam pressure gauge operates by the movement of a ___.

A check valve allows water to flow in one direction only.

The two classifications of air conditioners are package air conditioners and split-system air conditioners.

The two classifications of air conditioners are package air conditioners and split-system air conditioners.

A(n) ___ is matter that contaminates air, water, or soil.

In an air atomizing burner, steam and fuel are discharged to the burner for combustion after the flames reach the end of the combustion chamber.

In an air atomizing burner, steam and fuel are discharged to the burner for combustion after the flames reach the end of the combustion chamber.