Sentence:  In other words , if an ideal gas is compressed and kept at constant temperature , the <WSD>work</WSD> done in compressing it is completely converted into heat and transferred to the surrounding heat sink . 
Meaning of the word marked with <WSD> tags:  (physics) a manifestation of energy; the transfer of energy from one physical system to another expressed as the product of a force and the distance through which it moves a body in the direction of that force