So I am starting this blog with one simple example. We all drink water at our homes from a pot made of soil (math or matka). Water inside it is cooler than the outside temperature. How does it get cooled? The answer is, the pot is porous and some droplets come out from inside and spread on the outer surface. This water is eventually get vapourised. It takes heat from the inside water to get vapourised and hence the inside water becomes cool. The pot itself is bad conductor of heat and hence the inside water is insulated from outside temperature to some extent. But there must be some heat flow from the surroundings to inside water and hence at some point the equilibrium is attained and no further cooling is possible. So from this knowledge write down the equations of heat flow and obtain the temperature of inside water assuming the outside temperature is 30 or 40 degree celcius. Assume thermal conductivity of pot k = 1 W/mK. (assume every other thing required; you can get these data from the net if you search a bit). Is there a critical temperature (of surroundings) above which the cooling is not possible; is it below the boiling point?
For further cooling, traditionally, a cloth is wound around the pot. How does it help to cool it further? Is there any other simple method for further cooling?
