Compressed Breathing Air – Normal air processed by a compressed breathing air system meeting the purity requirements of this standard.

This expansion and the lack of normal air motion make the area intensely cold.

Scientists can then compare those plants directly to others growing in normal air nearby.

Clean the air cleaner element by blowing compressed air through it in the opposite direction to normal air flow.

This is the reason that hot air tends to rise above normal air, a concept that hot air balloons, operate on.