It absorbs and gives up heat as it changes from a liquid to a gas to a liquid.
(It; absorbs; ) (It; gives up; heat; T:as it changes from a liquid to a gas to a liquid) (it; changes; from a liquid to a gas; to a liquid)
It It it
absorbs gives up changes
heat T:as it changes from a liquid to a gas to a liquid
from a liquid to a gas to a liquid