1. What is better to warm up in a cold night a kg of hot water at 70⁰C or a kg of gold at the same temperature? Why? If we assume that the gold will protect you from the cold for about 10 minutes, how long would the water last?

2. What is happening with the parameters (pressure, volume, and temperature) of an air bubble released by a frog at the bottom of a lake? Explain why. Assume a summer day.