If you place your cold hand on a warm furnace, it becomes warm due to but, if you climb a ladder and hold your hands in the warm air rising from the furnace, they become warm due to

Conduction of heat

Convection of heat

Explanation:

Conduction of heat is defined as the process by which heat is transferred from one particular body to another due to direct physical contact. It basically occurs in solids due to the differences in the temperature.

Convection of heat is defined as the process by which the lighter air rises up due to the increasing temperature and the cooler air sinks due to the higher density, generating a circular type of airflow pattern. It takes place in both liquid as well as gas.

Thus, placing a cold hand on a warm object leads to the warming of the hand due to the heat conduction process, and on the other hand, climbing a ladder and holding hands in the warm air rising from any hot object, makes the hands warm due to the heat convection process.

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