Final answer:
When two objects at different temperatures come into contact, heat flows from the object with a higher temperature to the object with a lower temperature until they reach thermal equilibrium.
Step-by-step explanation:
When two objects at different temperatures come into contact with each other, heat will flow from the object with a higher temperature to the object with a lower temperature. This is because objects with higher temperatures have more thermal energy, which is the energy associated with the random motion of atoms and molecules.
For example, let's consider two objects: Object X at a temperature of 100 degrees Celsius and Object Y at a temperature of 20 degrees Celsius. When these two objects come into contact, heat will spontaneously transfer from Object X to Object Y, causing Object X to lose thermal energy and Object Y to gain thermal energy.
Heat always flows from an object at a higher temperature to an object at a lower temperature until thermal equilibrium is reached and both objects have the same temperature.