Heat Capacity Calculation Check.

  • #1
grahamreitz
1
0
Hello PF,

Is the following calculation correct for the amount of time it would take to raise the temperature of a given mass of material?

Q = heat in J
W = watts
m = mass in kg
c = specific heat in J/kgC
Tf = temperature final
Ti = temperature initial

Q = m * c * (Tf - Ti)

m = 5 g = 0.005 kg
c = 450 J/kgC (Nichrome)
Tf = 45 C
Ti = 15 C

Q = (0.005) * (450) * (45 - 15) = 67.5 J

W = 14

Time to heat material from 15 C to 45 C at 14 W:

t = J / W = (67.5 J)/(14 W) = 4.82 s

I'm not measuring this empirically. Although, my temperature probe is a little slow.

Thanks,
Graham
 

Answers and Replies

  • #2
Q_Goest
Science Advisor
Homework Helper
Gold Member
3,012
42
Looks good to me.
 

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