BCC's - see original at end. One could conceivably make a "refrigerator" using a rubber band that is operated as a "driven belt", and stretched and contracted along different parts of it's path. Could make for an impressive demonstration. Russell On 8 September 2012 19:23, Sean Breheny wrote: > A long time ago I noticed that a rubber band feels cool after it is > stretched and released. Given that the temperature difference is > small, I never could figure out a good way to measure it. I just > realized that my recently-acquired thermal camera is perfect for it. > Well, I just did the experiment and it clearly is true - this > particular band cools by about 2 degrees C (below ambient): > > http://www.youtube.com/watch?v=3D1NS55QTb0H8 > > I have since discovered that others on Youtube have already done > exactly the same thing (view rubber band cooling on thermal cameras). > My video is better, though - more modern camera :) --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .