which uses combustion by moving pistons, which respond to a change in pressure?\nheat engine\nfurnace\nrefrig…

which uses combustion by moving pistons, which respond to a change in pressure?\nheat engine\nfurnace\nrefrigeration unit\nheat pump
Answer
Brief Explanations:
A heat - engine uses combustion to move pistons which respond to pressure changes. A furnace is mainly for heating a space by burning fuel, a refrigeration unit cools by removing heat, and a heat pump moves heat between areas.
Answer:
A. heat engine