In view of the poor heat transfer conditions of the cylinder ina small air compressor, a scheme is put forward for reinforcing heat trans-fer of cylinder by latent heat of vaporization.

But some syllables such as "ba" and "da" can be misheard as "pa" and "ta" when small bursts of air are simultaneously squirted onto the skin from a compressor, the researchers report.

The piston compressor, the oldest in places such as the cold storage, many central air conditioning unit, and small piston compressor in the fridge and air conditioning.