# a no of water droplets each of radius r collesce to form a droplet of radius R .find change in temperature3T/J(1/r+1/R)3T/J(1/r-1/R)-3T/RJ2T/RJ

Arun Kumar IIT Delhi
$J=\Delta PV=nR\Delta T\\ \Delta P=2T/(1/r-1/R) \\=>J/\Delta P=V$