The content of oxygen is normally ______...
The content of oxygen is normally ________% in air.
Answer» D. 21
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The term __________ is used to indicate the science of controlling air with respect to humidity, temperature, movement of air, bacteria content, etc.
the difference of temperature between the outside air and inside air tends to the deposition of moisture in the room surfaces known as ___________
________________ Gas hampers oxygen from reaching the brain.
Oxygen and Nitrogen gas in hospitals is one type of
For comfortable working, the ___________ content should be limited to about 0.6% by volume.
The term _________ is used to mean the free passage of clean air in a structure.
It is quite evident that the incoming air for ventilation should be ________ in summer and ________ in winter before it enters the room.
Exhaust system, supply system, air conditioning, etc. comes under ________ type of ventilation system.
_____________ is the process by which the required amount of moisture is added in the air.
the maximum rate of air change is ______
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