Question

hii friends
what is newton's law of cooling?explain.

Answer 1

MARK AS BRAINLIEST Newton's law of cooling states that the rate of heat loss of a body is directly proportional to the difference in the temperatures between the body and its surroundings provided the temperature difference is small and the nature of radiating surface remains same. As such, it is equivalent to a statement that the heat transfer coefficient, which mediates between heat losses and temperature differences, is a constant. This condition is generally true in thermal conduction(where it is guaranteed by Fourier's law), but it is often only approximately true in conditions of convective heat transfer, where a number of physical processes make effective heat transfer coefficients somewhat dependent on temperature differences. Finally, in the case of heat transfer by thermal radiation, Newton's law of cooling is not true.

Sir Isaac Newton did not originally state his law in the above form in 1701, when it was originally formulated. Rather, using today's terms, Newton noted after some mathematical manipulation that the rate of temperature change of a body is proportional to the difference in temperatures between the body and its surroundings. This final simplest version of the law given by Newton himself, was partly due to confusion in Newton's time between the concepts of heat and temperature, which would not be fully disentangled until much later.[1]

When stated in terms of temperature differences, Newton's law (with several further simplifying assumptions, such as a low Biot number and temperature-independent heat capacity) results in a simple differential equation for temperature-difference as a function of time. This equation has a solution that specifies a simple negative exponential rate of temperature-difference decrease, over time. This characteristic time function for temperature-difference behavior, is also associated with Newton's law of cooling.

Answer 2

let's suppose you wish to cool down a beverage. Now will the room temperature brought by you be sufficient to keep the beverage cool at the time of your party ?is there a way to know the time taken by the beverage to reach the temperature of the refrigerator? yes,and that is known as the Newton's law of cooling

NEWTON'S LAW OF COOLING
named after the famous English physicist,sir Issac Newton the law states that the rate of heat lost by a body is directly proportional to the temperature difference between the body and it's surrounding areas.

I HOPE IT'S HELPFUL TO YOU