Heat bag - how does it work?
December 22, 2005 9:52 PM Subscribe
My employer has a knack for finding the oddest Christmas presents for the staff. This year: a heat bag. How does it work?
posted by Termite to Grab Bag (14 answers total)
It's a plastic bag filled with a clear, heavy liquid. Inside the bag a metal chip is floating. Bend the chip and the liquid solidifies (it looks like candle wax) and gets warm. To use the bag again, it must be "recharged" by boiling it (the contents of the bag turns liquid again). For an non-scientist, this is pretty mysterious.