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The defining equation for thermal conductivity is =, where is the heat flux, is the thermal conductivity, and is the temperature gradient. This is known as Fourier's law for heat conduction. Although commonly expressed as a scalar , the most general form of thermal conductivity is a second-rank tensor .
The flash point of a material is the "lowest liquid temperature at which, under certain standardized conditions, a liquid gives off vapours in a quantity such as to be capable of forming an ignitable vapour/air mixture". [1] The flash point is sometimes confused with the autoignition temperature, the temperature that causes spontaneous ignition.
Documentary and mockumentary films, such as March of the Penguins, Super Size Me, Borat and Surf's Up, were popular in the 2000s. 2004's Fahrenheit 9/11 by Michael Moore was the highest grossing documentary of all time. Online films became popular, and conversion to digital cinema started.