3) A cylinder fitted with a piston contains a gas at a given temperature and pressure. The gas cools at constant pressure to a new volume by the transfer of heat. How would you define the system to determine the amount of work done and heat transferred? Also show the process path in a P-V diagram. 4) A mercury thermometer is calibrated at the ice and steam points. Using the following data, calculate the reading of this thermometer at 200C. Indicate your assumptions