Why did the hot water rise? Use faster, molecules, energy, density in your answer.

Convection

Explanation:

Hot water will rise due to heat transfer by convection occurring in the heating system.

When a fluid is heated, the molecules will gain thermal energy. As the thermal energy of the liquid increases, the molecules will have heat which is average kinetic energy in the system. This causes them to be less denser and they rise in the cooking medium. As they rise, the colder part of the water sinks down to replace them in the pot. This exchange sets up convection cells in the heating medium.

The mass has escaped into a gas which you can not see so the law stays true.

Aconductor easily transfer heat