The change in temperature (T) as a function of depth (z) measured towards the center of the planet is called the thermal gradient (dT/dz). In regions where conduction dominates, heat flow is related to the thermal gradient by Fourier' s law:

The thermal conductivity (k) is related to the density (p), specific heat at constant pressure (cp), and thermal diffusivity (j) of the material:

The rate at which layers gain (or lose) heat is given by

Combining this with Eq. (3.27) gives the thermal diffusion equation, also called the heat conduction equation:

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Renewable Energy Eco Friendly

Renewable Energy Eco Friendly

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable.

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