Task: Question Answering
Input (English): Process:  -A fuel is heated in an oven -Above the oven is a tank of water that is sealed -The tank of water begins to boil above the oven -A the water boils steam is created -The steam is denser than air so it needs a place to go -The steam is forced out of the tank and into a piston -The piston moves up -The valve of the piston closes -The valve on the next piston opens -The steam fills the next piston, driving it up, and the other one down -
 Question: What is the effect of pressure builds up under crust on less power produced by the steam engine.?
Output (English): none