And so the change in temperature in both cases is zero. When we talk about going from this guy to this guy or from this guy to this guy, the intermediate phases between the phase changes, we talk about energy input that goes into increasing kinetic energy of the system because kinetic energy of the system is what increases temperature. Because we want to go from zero to 100 and from negative 60 to zero. We want to increase temperature and not the potential energy of the system. So let's talk about one last thing. So when we go from solid to liquid, that's called melting.