Why hotter a substance faster it cools?

The statement "the hotter a substance, the faster it cools" is not generally true. The rate at which a substance cools depends on several factors, including the temperature difference between the substance and its surroundings, the thermal properties of the substance and the surrounding environment.

Newton's law of cooling states that the rate of heat loss of an object is directly proportional to the temperature difference between the object and its surroundings. In other words, the bigger the temperature difference, the faster the object cools. This means that a hotter substance will generally cool down faster than a cooler substance if they are in the same environment.

However, there are exceptions to this rule. For example, if a substance has a high thermal mass, it will take longer to cool down even if it is at a high temperature. This is because a substance with high thermal mass has more energy stored in it and therefore takes more energy to remove in order to cool down.

Additionally, the surrounding environment can also affect the rate of cooling. If the surrounding environment is very cold, a hot substance will cool down faster than if the surrounding environment is warmer. This is because the temperature difference between the substance and its surroundings is greater in the first case.

In summary, the statement "the hotter a substance, the faster it cools" is not generally true. The rate of cooling depends on several factors, including the temperature difference between the substance and its surroundings, the thermal properties of the substance and the surrounding environment.