From: utzoo!decvax!duke!harpo!npoiv!npois!houxm!houxa!houxi!houxz!ihnp4!ihuxr!lew Newsgroups: net.physics Title: Last of the tea discussion? Article-I.D.: ihuxr.279 Posted: Sat Jan 8 20:36:36 1983 Received: Mon Jan 10 01:12:54 1983 Jeff Halle stated: "Adding the cream will reduce the temperature of the tea by the same amount whenever it is added. That is, the temperature will drop by x degrees, not by x%." The error of this assertion is obvious if one considers the limiting case when the tea is nearly at room temperature. I'm sure most readers know that the final temperature is the weighted average of the initial temperatures, the weights being the heat capacities. This is just energy conservation: Ca*Ta + Cb*Tb = (Ca + Cb)*Ta+b Lew Mammel, Jr. ihuxr!lew