Chronology | Current Month | Current Thread | Current Date |
[Year List] [Month List (current year)] | [Date Index] [Thread Index] | [Thread Prev] [Thread Next] | [Date Prev] [Date Next] |
Yes, imagine a gas instead of the spring. As the gas expands it
pushes the piston and does work.
The Temperature of the gas will go
down and the Internal energy of the gas will go down. So yes, the
Internal energy is not constant. What is your argument that the
Internal energy SHOULD be constant?
If the containing walls pass neither matter nor energy, the system
is said to be isolated. Then its internal energy cannot change.