W = mas=m(V/T).(Va.T) =m(V/T)/A.(Va.T)A = m(V/T)/A.[(V/2)T]A = (1/2)P(Volume )
P=pressure, A=area
更新1:
I we press an opened plastic bottle, the gas is out. I mean pressure of an object, and volume of the gas in the bottle.
更新2:
Do we have the 1/2 factor?
更新3:
Pressing contains a length. Because we need to calculate the average acceleration and then find the pressure, and need to calculate average change of volume per time.
更新4:
Why the pressure inside will not be afffected by the pressing?