Today we did some labs that the pressure is constant while the temperature and volume changes.
The piston is free to move. thus the pressure inside is equal to surrounding pressure. Then, as we put the flask into hot water, the volume will increase.
We can use w=p*\delta V for constant pressure. We did this thermal expansion problem from the picture above.
We also consider the kinetic energy of molecules inside the container. The final formula was shown in the picture above.
Base on the formula before, we can calculate the relationship between percent change in T and V.
Lastly, we did a problem that uses the formula we got today as above.
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