A storage tank for natural (NG) has a top dome that can move up or down as gas is added or subtracted from the tank maintaining 1.1 bar, 17 C inside. A pipeline at 1.1 bar, 17 C now supplies some NG to the tank. Briefly answer the following questions.
a) does the NG change state during the filling process? why or why not?
b) what happens to the flow work?