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# Thermodynamics doubt

Doubt question:Find the rate $$v$$ with which helium flows out of a thermally insulated vessel into vacuum through a small hole. The flow rate of gas inside the vessel is assumed to be negligible under these conditions. The temperature of Helium in the vessel is $$1000 K$$.

Irodov: 2.42

My approach to the problem is stated as under.

The answer provided, unfortunately, turns out to be $$3.3 km/s$$. Please help me finding my error out, thanks.

Note by Swapnil Das
9 months, 1 week ago

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bhai tera tarika thik hai par tu pressure eergy wali term bhul raha hai matlab tune pressure ka kuch kiya hi nahi that's a blunder ! @Swapnil Das · 8 months, 3 weeks ago