Question

When is thermal equilibrium achieved between two objects?

Answer 1

Thermal equilibrium is when a hot and cold object (could also be air) come in contact with each other and over time become the same temperature.
thermal equilibrium is reached when both objects are the same temperature.

Answer 2

Thermal equilibrium is achieved when two identical objects have the same temperature after contacting and exchanging energy.

Step-by-step explanation:

By bringing two bodies into contact at a different temperature, the one with the highest temperature yields part of its energy to the one with the lowest temperature until its temperatures equalize. This is what we call "thermal equilibrium". In other words, thermal equilibrium is the state in which the temperatures of two bodies that initially had different temperatures are equalized. When the temperatures equalize, the heat flow is suspended, and this is how the equilibrium situation is reached.

Thermal equilibrium is achieved when two identical objects have the same temperature after contacting and exchanging energy.