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Originally Posted by KenWittlief
the only point that doesnt sit right with me is you used the mass of your whole finger (1cm thickness) and if I understand the equation you used then which part of the finger is rasied to 120ºF? the surface of the side in contact with the metal, or the entire mass?
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I'm assuming that the whole finger is rasied to 120F. There was a couple issues that I couldn't easily resolve. First off, I wasn't sure how to model the heat transfer within the finger. I suspect that if I worked on this long enough, I could probably come up with some differential equation that'll do it. We'd need an equation that describes the rate of temperature rise in the finger at some distance from the surface. I doubt that it would be a very pretty one though. But hey, computers can solve anything.
The other issue was blood. Because it's flowing, it's essentially acting as a coolant. Although, because of the short time, I'm not sure how much it actually does.
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Originally Posted by KenWittlief
The other question is, what temp can we endure without being burned? 120ºF seems low. Tap water is usually 160 - 180ºF.
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Well, I was going off of cooking temperatures. For beef (which I'm assuming is the closest animal to human), medium-rare is 130F. And through the wonder that is Google, here is a handy dandy
chart.