body tenp

[spldbrtz]

HI I need help on finding research on my topic and a few ideas for my title, my science investigation will be on body temp. i have come up with the question, why is that when you blow in something hot it cools but when you blow on some thing cold such as your hands why do they warm? does the temp change? Can I get some advice on how to research this. Thanks a Bunch

[deleted-2574]

Hi spldbrtz,

My favorite research tool (for web research) is answers.com. It takes natural language inputs and ultimately hooks up to google.com (though I think it massages the google output.).

I submitted "why is that when you blow in something hot it cools but when you blow on some thing cold such as your hands why do they warm?" to answers.com, and a good answer is there. But, it's not until the 4th or 5th page.

A better use of answers.com would be to tighten up the query!!

[deleted-2574]

Hi spldbrtz,

Oops, I was too optimistic. A good hit is actually is not until the 7th or 8th page of the answers output. Definitely, a tighter question is needed!

[deleted-71588]

You might want to search on Heat Transfer Convection. Here is one that I found that will give you some history on the physic involve in heat transfer.

http://sol.sci.uop.edu/~jfalward/heattr ... nsfer.html

[ghariman]

Hi there,

The reason is what is called equilibrium temperature.
The air you blow from your mouth has an temperature to it.
Say we call this X degrees celcius.

Now when you blow on something cold (something less than X degrees celcius), then the cold thing will warm up (it will acquire heat) from the air from your mouth and the cold thing will tend to go to X degrees celcius.

Now when you blow on a hot thing (something more than X degrees C) then it is the other way around. The hot thing will tend downwards towards X degrees celcius.

And that is the answer to your question. Hope this helps !