From: utzoo!decvax!harpo!npoiv!npois!houxm!houxa!houxi!houxz!halle1 Newsgroups: net.physics Title: Re: Last of the tea discussion? Article-I.D.: houxz.243 Posted: Mon Jan 10 10:37:32 1983 Received: Tue Jan 11 02:37:07 1983 References: ihuxr.279 Lew is incorrect in his statements. The final temperature is a weighting of the heat CONTENTS of the fluids. The equation he states is far too simple on the left and incorrect on the right (although that may be due to typos). The correct eqn. is: m(tea)c(tea)(T[i]-T[f])+m(milk)c(milk)(T[i]-T[f])=0, where c is the specific heat or heat capacity, and the T's are the obvious ones. Lew is correct that my statement is wrong if the two liquids are too close in temperature. If the temperature change when the milk is added immediately is greater than the difference in temperature when the milk is added later, then the temp. cannot drop the same amount. However, this is a case that would not occur (why heat it if you're going to drink it at room temperature). I did not state the assumption that the temperatures were far enough above room temperature, which by the way does not have to be too far if only a moderate amount of milk is used, because I felt it was obvious and my discussion was too long as it was. I will be more careful in the future. Please address further discussion through mail to clear the net for new and/or more interesting topics. Jeff Halle houxz!halle1