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WOLFRAM

DEMONSTRATIONS
PROJECT
StefanBoltzmann Law
heat
radiation
temperature
in
degrees
Kelvin
Celsius
emissivity
e
0
.
5
radiator
temperature
T
1800
.
ambient
temperature
T
c
300
.
axis
limits
T
axis
minimum
0
.
T
axis
maximum
2500
.
P
axis
maximum
1
.
2
×
10
6
emissivity
=
0
.
500
0
500
1
000
1
500
2
000
2
500
0
200
000
400
000
600
000
800
000
1
.
0
×
10
6
1
.
2
×
10
6
T
source
(
°
K
)
P
(
watt
/
m
2
)
=
297
.
393
(
kW
/
m
2
)
Stefan

Boltzmann
Law
:
P
=
e
σ
A
(
T
4

T
c
4
)
This Demonstration plots the radiated heat from a gray body having a given emissivity as a function of its temperature and that of its surroundings using the Stefan–Boltzmann law.