how can compressed gas be used as a lubricant?

Answer 1

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Often a cushion of air can be used to reduce friction between two moving parts (the most common place you might find this in everyday life is an air hockey table). Another topic you may want to look up in relation to this is "air bearings." It is usually possible to achieve extremely low friction values using air as a lubricant.

Answer 2

i dunno, but beer workd pretty good!!