# A sample of gas has a particular volume at 0^o C. To what temperature must it be heated, if the pressure is kept constant, to double its volume?

Since the temperature and volume are directly proportional (when the pressure is kept constant), doubling the volume requires doubling the temperature. ${0}^{o}$ $C$ = $273$ $K$. Doubling this yields $546$ $K$ which is ${273}^{o}$ $C$.