http:
//www.goiit.
com/posts/show/0/content−class−11−heat−thermodynamics−903651.htm?
selectedParentTagId=194&
selectedChildTagId=209&
selectedTopicId=903651 hereWhen unit mass of a substance expands from a volume of
V1to volume
V2at constant temperature, then the change in internal energy isdU = [L
− P
V2− V1]what is &#
39;L&#
39; ?????