# A balloon is filled at 27°C at 1atm pressure by 500 m^3 He. then find the volume of He at -3°C and 0.5 mm Hg pressure

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A balloon is filled at 27°C at 1atm pressure by 500 m3 He. then find the volume of He at -3°C and 0.5 mm Hg pressure.

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$\frac{P_2V_2}{T_2}$ = $\frac{P_1V_1}{T_1}$