Simplify the following text for a Grade 5 native English-speaking person.
Original: The word enthalpy is based on the Greek word enthalpos ( á 1\/4 '' Î 1\/2 Î Î Î '' Ï Î Ï ) , which means to put heat into . It comes from the Classical Greek prefix á 1\/4 Î 1\/2 - , en - , meaning to put into , and the verb Î Î Î '' Ï Î Î Î 1\/2 , thalpein , meaning `` to heat '' .
Simplified: The name comes from the Greek word `` enthalpos '' ( Î Î 1\/2 Î Î Î '' Ï Î Ï ) , meaning `` to put heat into '' .