b) Write 3 – 4 sentences to describe the first law of thermodynamics and use it to describe what happens when two substances at different temperatures come in contact with each other.
I know the first law states that "energy can neither be created nor destroyed" but I do not understand the second part of the question
Substance A is hot and substance B is cold. They come together. The hot material loses heat and the cold material gains heat but the heat lost - heat gained so heat (energy) is not created or destroyed but relocated (moved around).
The first law of thermodynamics, also known as the law of conservation of energy, states that energy cannot be created or destroyed, but it can be converted from one form to another or transferred between systems. When two substances at different temperatures come in contact with each other, heat transfer occurs. The substance at a higher temperature transfers some of its thermal energy (heat) to the substance at a lower temperature until they reach thermal equilibrium, where the temperatures of both substances become equal. This heat transfer follows the first law of thermodynamics because the total amount of energy in the system is conserved, even though it is transferred from one substance to another.
