How many food calories does it take to heat up a pound of ice to body temperature?

Question

Please no fake answers. There is a numerical answer. I'm not planning on trying this, I'm just curious.

Answer 1

You'll need to either rephrase your question more exactly or be happy with a general answer.

"Ice" can have any temperature less than 0 C.

There are 3 general steps to this calculation:

1) Heat the ice to its melting point.
2) Melt the ice.
3) Heat the ice from its melting point to body temperature.

It's usually easier to do this is metric (for a physical science class) rather than imperial units (which is still common in the health fields).

For all calcs, let m = 454 g (1 lb.).

For steps 1 and 3, the equation is E = m*cp*dT, where m = mass, cp = specific heat, and dT = change in temperature.

For step 1, cp = 2.03 J/g. For step 3, dT for step 3 is 37 C and cp = 4.18 J*g/C. Note for the picky - cp *isn't* a constant, but it's alot easier to say that it is for these "back of the envelope" calculations.

For step 2, the heat of fusion of ice is 334 J/g. E = H*m, where H = heat of fusion and m = mass.

Finally, 1 Food Calorie (Cal = kcal) = 1000 calorie = 4.184 J.

Assuming -5 C ice, I get around 54 Cal as an answer. Heating the ice isn't going to need alot of of the total energy (unless you start with sub-artic ice) for the process. About 2/3 goes into melting the ice and the remainder to heating it.

Not exactly a great way to diet, :-) when you compare it to the number of Calories in a order of fries (500 Cal) or the amount of energy you burn by sleeping (about 72 Cal/hr for a 180 lb person).

Answer 2

1 food calorie equals 1000 regular calories
1 pound ice is appx 453 grams
Body temperature is 37C
1 calorie is required to increase 1 gram water 1 degree
80 calories to melt 1 gram ice

Q=453(1)(37)+453(80) {heat water}+{melt ice to water}
Q=16761+36240= 53001calories
divide by 1000 to take to food calories =53 food calories

Now all this assumes that you run the exeriment in a closed isolated system with no energy lost to environment.

Answer 3

A pound of ice is equivalent to how many mL of water, and what temperature is the ice?

Assuming the answers to the above are 454 and -10°C, then the answer is (37-(-10)) * 454 / 1000 = 21.338. I think that's the answer you're looking for...

Answer 4

I read that it was about 200 calories to heat up a really cold glass of water. So you can go off of that...

I don't have a source for you though I'm sorry. It was on a website for foods with "negative calories" (foods like celrey where you burn more calories digesting then you consumed)

Answer 5

advance your metabolism. Your physique is in maximum cases run off an potential source called ATP. every time you burn an ATP you create potential and warmth. So the extra potential your physique needs to maintain itself going the extra warmth it additionally will create. Your physique will purely burn the quantity of ATP that it desires, in any different case it extremely is going to save it as glucose. If saved no warmth would be made whether it may act as insulation. At relax maximum of your warmth is created by capacity of your liver, heart, ideas, and endocrine glands. Your muscle tissues could make a contribution approximately 20-30% the extra muscle which you have extra potential is mandatory to help them and extra warmth would be generated. while you're continually chilly this could be a demonstration of a thyroid issue. i might look into different indications of an underactive thyroid basically to be secure, indexed under are some. it extremely is often handled by capacity of taking a hormone pill on a on a daily basis foundation. • Fatigue or loss of potential • Weight benefit • Feeling chilly • Dry epidermis and hair • Heavy menstrual sessions • Constipation • Slowed questioning

Answer 6

100 calories = heat for 1mL water to go up 1 degree celcius.

do the conversions yourself

Answer 7

I think you should do the experiment yourself. But thanx for the 2pts.

Answer 8

http://www.dietpower.com/phweb0804.htm