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Re: Stop using calorie?




(James Mclean) writes:

I am tempted to wonder if you understand what 'calorimetry' means, at
least in the way Ludwik and many others are using it. 'Calorimetry' is
the
measurement of changes in internal energy, usually* by the means of
measuring the temperature change of a object with known heat capacity
(as in a 'bomb calorimeter'). In its modern usage, 'calorimetry' has
*nothing* to do with 'caloric' the non-existant substance (except
etymologically).

Now, to do Joule's paddle wheel experiment, you need to measure the
work done, measure the change in internal energy, and compare them. The

second step *is* calorimetry. I don't see any way around that.


Your point is very well taken

Herb Gottlieb from New York City
(Where calorimetry used to mean adding an invisible substance (called
heat) from a hot aluminum block to cold water in a double wall
calorimeter. Heat gained by the cold water equal the heat lost by the
aluminum block)