1) Specific heat of aluminum is 0.22 cal/g- o C. What is the value of specific h
ID: 1590725 • Letter: 1
Question
1) Specific heat of aluminum is 0.22 cal/g-oC. What is the value of specific heat in (a) kcal/kg-oC anf (b) Btu/lb-oF?
Can you show me how you went about the conversions so I can add the steps to my test study guide?
2) In solar heating application, heat is stored in some medium until it is needed. Should the medium have a high or low specific heat? Explain.
I would think it would need a higher specific heat...? My reasoning for that is that steam burns more than hot water because it has a higher specific heat. Shouldn't that apply to solid materials as well? Am I anywhere near the ball park?
3) If I do an experiment with specific heats, and all of the specific heats for different materials are given, how would I determine the final temperature? Rewrite the given equation for the final temperature: mscs (TH - T) = mwcw (T - T0) + mstrcstr (T - T0) where s = solid; w = water; str = the stirer used for the calorimeter
Explanation / Answer
answer for the second is :
If something has a high specific heat, you need less of it to store a given amount of energy. That's usually a plus, because it means something smaller and cheaper, although not always cheaper.
Water has a pretty good specific heat, and is cheap. However, it's a liquid, and needs to be in containers or a tank, and if you leave it in an open pond, bugs and stuff get in. If you have lots of space, and want something dirt cheap, you could use dirt. It won't leak, but you need more of it, and people might object to having large amounts of dirt in the building, depending on what it is.
answer for 1st :
Specific heat of aluminum is 0.22 cal/g-oC
==> cal/g-oC is 0.22 kcal/kg-oC
here 1 K cal = 1000 cal and 1 Kg = 1000 gms. The numerator and denominator 1000 is cancelled hence we get same.
==> cal/g-oC is 0.22 Btu/lb-oF
weknow 1 BTU = 252.164 cal.
on lb = 453.592 gms
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