Задача id12838

The cylinder contained a certain amount of gas at atmospheric pressure P1 = l atm. With the valve open, the cylinder was heated, after which the valve was closed and the gas cooled to a temperature of T2 ~ 10°C. At the same time, the pressure in the cylinder dropped to P2 - 0.7 atm. How many degrees was the balloon heated to?

Detailed solution. Format gif