Home » Ask & Discuss » Physics. » Thermal Physics « Back to Discussion

Thermal Physics

Cool goIITian

Joined:	14 Apr 2008
Post:	55

21 Apr 2008 21:06:53 IST

0 People liked this

425

Constants

None

What r the folowing

Stefan's constant

Heat current

Wien's constant

Thermal resistance?

Share this article on:

Comments (2)

chemicaltester

Scorching goIITian

Joined: 12 Mar 2008

Posts: 233

21 Apr 2008 23:55:13 IST

Like 1 people liked this

1)the total energy radiated per unit surface area of a black body in unit time is proportional to the fourth power of the temperature in kelvin.
here the constant of proprtionality is stefans constant
its value is5.670400×10?8 W·m-2·K-4

3)there is an inverse relationship between the wavelength of the peak of the emission of a black body and its temperature.
here the constant of proprtionality is weins constant such that
max wavelength =b/t where b is constant

2)A heat current is a kinetic exchange rate between molecules, relative to the material in which the kinesis occurs. A specific pattern of collisions among molecules, similar to a river bed effect on the direction of water travelling therein. (taken from wikipedia)
value of b is 2.897768 5(51) × 106 nm K.

2)

$^Mujtaba^$

Blazing goIITian

Joined: 15 Nov 2007

Posts: 436

22 Apr 2008 00:34:35 IST

Like 0 people liked this

Stefan's constant:
Stefan gave a law in radiation.
The law states that, 'The amount of heat energy radiated per unit area per unit time from a black body is directly proportional to the fourth power of its absolute temperature.'

The constant of proportionality in this relation is known as Stefan's constant whose value

is 5.67 x 10^8 watt/metre^2 kelvin^4.

Quick Reply

Reply

	Some HTML allowed.
	Keep your comments above the belt or risk having them deleted.
	Signup for a avatar to have your pictures show up by your comment
	If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team