The heat - transfer version of Newton 's law states that the rate of heat loss of a body is proportional to the difference in temperatures between the body and its surroundings .
Newton 's law ( as noted ) requires a constant heat transfer coefficient .
The heat - transfer version of Newton 's law , which ( as noted ) requires a constant heat transfer coefficient , states that the rate of heat loss of a body is proportional to the difference in temperatures between the body and its surroundings .