Rock Hand Warmer

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Introduction: Rock Hand Warmer

These hand warmers are great to stick in a cold coat pocket.  You just grab a rock, clean it off, stick it in the oven, wrap in foil to control the loss of heat, then put it in your pocket.  I like to use them on camp outs, except you put it over the fire there.  

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    12 Comments

    how long time how warm in the oven?

    Friends & I do basically that same thing when we have get-togethers. We almost always have a bonfire to heat the rocks, but we wrap them in newspaper. It insulates them so that you don't burn yourself with it and the heat also lasts longer. Of course you don't want to carry a stack of newspaper on a hiking trip, then you could use a couple socks or something along that line that you would be packing anyway.

    Oh, these would be sooo nice and toasty after a hockey game!=] I wonder if they might stay warmer if I kept them in my solar oven while I'm outside(?) =^..^=

    Toasty.
    very effective, works every time

    Pay attention to the aluminum foil.
    Aluminum is a VERY GOOD termal conductor, so it will release the heat very well, meaning it will not protect your hand muck while you touch it.
    If hot stones can boil water (depends how hot you heat them) then, if wrapped in foil, they can burn your fingers.

    Take a look at:
    http://en.wikipedia.org/wiki/Aluminium
    http://en.wikipedia.org/wiki/Thermal_conductivity

    Why hot a woole sock ?

    Do these get really hot because of the foil?