Re: Physics help


The numbers seem reasonable (c for ice is correct, and Lf should be
about 100 times larger, so appears OK). If I fill a glass with ice cubes
colder than 0 degrees C, then top up with water, I don't see the water
freeze. Try an experiment, and see for yourself. It isn't easy to get 1 kg
of ice at -160C, so do it in reverse, using hot water to melt ice. Get 1
kg of ice cubes (that will give you a larger surface area than a single 1
kg block; 1 kg of crushed ice might be even better). The heat capacity of
water is about double that of ice, so get 1 litre (ie 1 kg) of water at
about 80C, and it should melt the ice, leaving you with very cold water.
Try it. Boiling water should leave you with water at about 10C, colder
than 80C should leave you with ice water. Of course, it'll warm up from
the surroundings as well as from the hot water, but you'll get an idea of
the amount of energy required to melt ice.

--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html

Timo, thank you so much for responding and also, adding to further help me
understand about phase changes. It is all very fascinating for sure. When I
originally got the -160 C I thought for sure I made a mistake. However, I
now realize the significance of how much energy is needed for phase changes.
Pretty amazing!


.

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