. What is better to warm up in a cold night a kg of hot water at 50C or a kg of gold at the same temperature? Why?

. What is better to warm up in a cold night a kg of hot water at 50C or a kg of gold at the same temperature? Why?
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.
Please explain in detail.