ASE Heating and Air Conditioning Terms & Definitions Practice Test

Question 1 of 3
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A colorless, odorless, non-combustible gas, heavier than air; can be compressed into a super cold solid known as dry ice; changes from solid to vapor at- 78.5C.
The unburned fuel products of combustion that are forced pass the piston rings and into the crankshaft during the combustion stroke.
In a transmission, where all gears are constantly in contact and turning with one another.
A lightweight material use of a four cylinder heads and other parts.