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## Homework Statement

This is the question as it was given...no other data was given.

Obtain Fourier's heat conduction equation in three dimensions in an infinite medium in steady state.What modifications will be required in case of a finite body?

**2. The attempt at a solution**

Well I can derive 3D Fourier's heat conduction equation not a problem,

∂u/∂t = h ∇

^{2}u (without radiation losses )

and at steady state it will be ∇

^{2}u = 0

here u(x,y,z,t) is temperature and h is thermal diffusivity.

But what I don't get is infinite medium and the finite body , will the finite body will have radiation losses ?,it has to do something with boundary conditions may be.I dont get the question properly ,please help me understanding it.

Thanks