Transfer of heat energy in gaseous medium or in vacuum known as thermal radiation.
Newton's law of cooling:For small temperature differences between a body and its surroundings.
The rate of cooling of the body is directly proportional to temperature difference and the surface area exposed.
T- Temperature of surface area of the body.To- Temperature of surroundingsA- surface area of the body,dT - depends upon transferred heat energy, mass and specific heat of the body.
Here the body loses energy. Temperature of the body decreases whereas surrounding increases we will get negative signs.
Applications of Newton's law of cooling.Newton's law of cooling used to measure time taken for the metal to cool down and estimating the temperature of a block of metal.
It is useful for detectives and forensic scientists to note down the temperature of the dead body and the room temperature of the crime scene.
These values are put in the mathematical formula of Newton's law of cooling and the time of the victim's death can be calculated effectively.