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| material moves and carries heat |
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heat air
hot air less dense
hot air rises and takes heat
can have forced convection where furnace blows hot air |
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Can transfer energy through vacuum
Heat from sun in radiation |
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| What power radiated by tunsten sphere at 500˙C in room at 200˙C? e = .35 |
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Q/t = eσA(Tw4-Trooom4)
.35(5.67 x 10-8)(4Π(.02m)2)(7734-2934)
P = 34.9 |
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| area perpendicular to heat flow |
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| time where Q (j) are transferred |
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Metal rod has one end in ice H2O and one in boiling. How much heat is transferred?
(conduction) |
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Q = kA(∆T/L)t
Q = (217)Π(.01m)2(100k/.5m)60s
=818 K = 195 cal |
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N= nNA; number of molecules
n = number of moles
NA = 6.02 x 10-23
m = mass of individual
M = molecular mass |
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use approximation of elastic collision
PV = NkT = RNT |
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K = 1.38 x 10-23
R = 8.31
N = number of molecules
n = number of moles
* NK = nR |
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| If as in conatiner and change P1V1T can use simplified form of gas law |
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