I have yet to find a source that adequately explains our reasoning behind why we describe something as "hot" and something as "cold".
Textbooks describe the water as something that is less hot than the sand in the summer, and conversely less cold than the sand in the winter. I know that H20 has stronger hydrogen bonds that make it harder for the sun to the H20 particles breaks apart. This decreases the avg KE of the water.
However, is my perception of hotness not due to the Temp (avg KE) of a substance, but rather the actual change in internal heat? Change in internal energy ΔU = Q - W. I assume that the sun ray's give the water just as much energy as the sand, and I assume that there is no difference between the work of the water and the sand. Thus, is the change in internal temp not the same?
If hotness is due to a difference in Temp, then why would the sand be colder than the water in the winter? The strong hydrogen bonds make it hard for the water molecules to increase in KE regardless of whether or not it is winter or summer, so wouldn't the sand then always be "hotter" than the water?