# Science Essay on Conduction Radiation and Convection

**Topics:**Electromagnetic radiation, Heat, Fundamental physics concepts

**Pages:**3 (648 words)

**Published:**January 9, 2011

Conduction

Conduction is the transfer of thermal energy between regions of matter due to a temperature gradient.

In the engineering sciences, heat transfer includes the processes of thermal radiation, convection, and sometimes mass transfer and often more than one of these processes occurs in a given situation.Shaun Prado 8F Shaun Prado 8F

Steady-state conduction Steady state conduction is the form of conduction.

This happens when the temperature difference driving the conduction is constant so that after an equilibration time, the distribution of temperatures (temperature field) in the conducting object does not change any further. Thus, all partial derivatives of temperature with respect to space have values yet all derivatives of temperature with respect to time are uniformly zero. For example, a bar may be cold at one end and hot at the other, but after a state of steady state conduction is reached, the special gradient of temperatures along the bar does not change, with time.

Relativistic conduction The theory of relativistic heat conduction is a model that is compatible with the theory of special relativity. For most of the last century, it was recognized that Fourier equation is in contradiction with the theory of relativity because it admits an infinite speed of propagation of heat signals. For example, according to Fourier equation, a pulse of heat at the origin would be felt at infinity instantaneously. The speed of information propagation is faster than the speed of light in vacuum, which is physically inadmissible within the framework of relativity. Alterations to the Fourier model provided for a relativistic model of heat conduction, avoiding this problem.

Convection is the movement of molecules within fluids (i.e. liquids, gases)...

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