The movement of heat energy from the core of the Earth towards the surface.
The flow of heat from the interior of Earth.
Heat flow is measured as the amount of energy transferred per unit of time. In SI units this would be measured in Joules per second. A Joule per second is the same as a Watt (W), so heat flow should be expressed in Watts. Because thermal energy is often measured in non-SI units, heat flow is often reported in other units, too. Air conditioners are rated in BTUs per hour. You will sometimes see ergs per second or calories per second.
this is the amount of heat leaving the Earth which varies from place to place, measured in mW m-2 (also known as heat flux).
Movement of heat from within the Earth or to the surface, where it is dissipated into the atmosphere, surface water, and space by radiation. Heat flow at depth is the product of the geothermal gradient and thermal conductivity and is measured in units of mW/m-2.
The rate at which heat moves from an area of higher temperature to an area of lower temperature. Btu/hr (W/hr). Heat flow is generally used to quantify the rate of total heat gain or heat loss of a system.
Movement of heat fr om within the earth to the surface, where it is dissipated into the atmosphere, surface water, an space by radiation.
The rate at which heat rises from the Earth's interior up to the surface.