jäähtymislakia

Jäähtymislaki, often translated as Newton's law of cooling, describes the rate at which an object loses heat to its surroundings. It states that the rate of heat loss of a body is directly proportional to the difference in temperatures between the body and its surroundings. In simpler terms, the hotter an object is compared to its environment, the faster it will cool down. As the object's temperature approaches that of its surroundings, the rate of cooling slows down.

Mathematically, this relationship can be expressed as dQ/dt = -hA(T - Ts), where dQ/dt is the rate of heat transfer, h is the heat transfer coefficient, A is the surface area of the object, T is the temperature of the object, and Ts is the temperature of the surroundings. The negative sign indicates that heat is being lost from the object.

Newton's law of cooling is a fundamental principle in thermodynamics and has numerous practical applications. It is used in fields such as engineering to design cooling systems for engines and electronics, in meteorology to understand atmospheric temperature changes, and in cooking to estimate how long food will take to cool. While a simplification of the complex heat transfer processes, it provides a useful and generally accurate approximation for many real-world scenarios, particularly when temperature differences are not excessively large.