Question

What occurs in a steam engine?

Answer 1

Steam at higher temperature gives it heat.
Steam engine converts heat energy in steam too mechanical energy.

Explanation:

Steam enters one side of piston and push it.this makes the piston to move..A slide vale controls steam from both sides alternately to push the piston.The movement of piston is converted into rotary motion by a fly wheel.
Picture credit.science how stuff works.