Helium in a steel tank is at 250 kPa, 300 K with a volume of 0.1m3. It is used to fill a balloon of helium.
When thetank pressure drops to 150 kPa, the flow of helium stops by itself.
If all the helium still is at pressure in the balloon varieslinearly with volume from 100 kPa (V=0) to the final 150 kPa.
How much heat transfer took place?
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