- #1

grahamreitz

- 1

- 0

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

T

_{f}= temperature final

T

_{i}= temperature initial

Q = m * c * (T

_{f}- T

_{i})

m = 5 g = 0.005 kg

c = 450 J/kgC (Nichrome)

T

_{f}= 45 C

T

_{i}= 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