Question
Given, n identical drops (each of radius r) of liquid of surface tension T and density ρ coalesce to form single drop. The energy released in the processes is converted into heat. Find the increase in the temperature of drop.
Solution
Given that 'n' drops coalesce to form a single drop.
During the process, energy is released which is converted into heat.
Energy released is given by, 
This energy is converted to heat.
Therefore, 
where, θ is the increase in temperature drop.
