Questions tagged [ideal-gas-behavior]

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Volume of compressed helium gas needed for FE test on ball valves

I'm currently doing a case study to find out the exact volume of helium gas required for FE tests on ball valves regards to the valves' volume and pressure class and the number of helium tanks needed ...
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Can we use PV^y = constant equation for irreversible adiabatic processes?

Example: One mole of monoatomic gas expands at initial temperature $T$ at constant external pressure of $\pu{1atm}$ from $\pu{1L}$ to $\pu{2L}$. To find final temperature, why can't we use $PV^y$ or $...