Question

list three examples of substances that have reached thermal equilibrium on the table below.
examples of thermal equilibrium
21.
22.
23.

Explanation:

Thermal equilibrium occurs when two or more substances in contact have the same temperature and there is no net heat transfer between them.

• Room - temperature water in a glass and the glass itself: After some time, the water and the glass will reach the same temperature as the surrounding air (assuming the room is at a constant temperature). Heat transfer occurs until their temperatures equalize.
• A metal spoon left in a cup of coffee (after a while): Initially, the coffee is hot and the spoon is cooler. Heat is transferred from the coffee to the spoon. Eventually, the spoon and the coffee (and also the cup if we consider it) will reach thermal equilibrium.
• A piece of ice - cream in a freezer: The freezer is at a low, constant temperature. The ice - cream, which is initially at a higher temperature (if it was just taken out of a warmer environment), will lose heat to the freezer. After some time, the ice - cream will reach the temperature of the freezer, and they will be in thermal equilibrium.

Answer:

1. Room - temperature water in a glass and the glass.
2. A metal spoon in coffee (after sufficient time).
3. Ice - cream in a freezer.