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Rate of Loss of Heat=
Rate of Cooling=
According to Newton's Law of Cooling I.e
When body Cools by Radiation from
to theta 
in time t Then ![\left[\frac{\theta_{1}-\theta_{2}}{t} \right ]=k\left[\frac{\theta_{1}+\theta_{2}}{2}-\theta_{0} \right ]](https://learn.careers360.com/latex-image/?%5Cleft%5B%5Cfrac%7B%5Ctheta_%7B1%7D-%5Ctheta_%7B2%7D%7D%7Bt%7D%20%5Cright%20%5D%3Dk%5Cleft%5B%5Cfrac%7B%5Ctheta_%7B1%7D+%5Ctheta_%7B2%7D%7D%7B2%7D-%5Ctheta_%7B0%7D%20%5Cright%20%5D)
Where 