FYI UF image uploader going away. Save yo stuff, hide yo wife

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Why didn't it burn through your entire arm???
A metal will lose heat 8 times more slowly each time you double it's volume (this was a rule of thumb someone taught me once, not sure how accurate it is).

So a very small amount will lose heat very quickly. It spatters as a liquid, hits your arm as a plastic, and by the time you react and start screaming and batting it away it's a solid.