Rate of Cooling of a liquid

Venki Ramachandran


A spread sheet is very useful to organize data and represent it in a graphical form. Given below is an interesting every day phenomenon, water cooling down from boiling point to room temperature. For this, water is first heated till it reaches boiling point (typically 212 degrees Fahrenheit at sea level) and then it is allowed to cool. The temperature is measured every minute for about thirty minutes. The rate of cooling is of course proportional to the difference in tempertures between the water and the environment. Greater the difference, faster the rate of cooling. As can be seen, after a while, the gradient of the curve starts flattening out and would eventually become flat once the water reaches room temperature.





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