Is the permeability of a material for air the same as its permeability for water vapor? Name some building materials that are impermeable to both air and water vapor.
What will be an ideal response?
The permeability values of a material for air and water vapor are generally different. Metals and glass are impermeable to both air and water vapor.
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All pipe threading machines have _____, which hold and turn the pipe.
a. ratchet drives b. rotary vices c. dies d. chucks
Three behaviors/tasks that mice have as part of the colony structure:
What will be an ideal response?
The ____, which is a running list on the right side of most of the school drawings, identifies all the material items in the building by a legend number.
A. material schedule B. material legend C. parts list D. parts schedule
Why is it most important to take special precautions when working with Schrader valves?
A) They can cause irreparable system damage if improperly used. B) Their opening leads to the release of a large amount of refrigerant. C) The type of refrigerant that passes through them is exceptionally toxic. D) They are most easily broken during the process of tightening.