➢ How a hot cup of coffee left in a cool room gets colder?

This process is an example of second law of thermodynamics, which states that heat transfers occur spontaneously only from higher to lower temperature bodies. If a hot object comes in contact with any cold object physically, then there will be transfer of energy from hot object to cold object. After some time, the temperature of the hot body will fall down and the temperature of the cold body will rise up till the time they both achieved the same temperature (situation of thermal equilibrium). So, the hot cup of coffee gets cold because it transfers heat to its surroundings.

Categories: Science