Evaporation is a very minor effect when both liquids are at 4 deg C IMO
It's a big part IMO. Evaporation is important if the temperature of the water sample is high and the container has a large exposed surface area. Evaporation has the effect of removing mass from a high temperature sample, which will then compensate for the greater temperature range. <img src="/ubbthreads/images/graemlins/think.gif" alt="" />
