delta function

delta function

noun Physics, Mathematics.
a generalized function having the value 0 except at 0, the value infinity at 0, and an integral from minus infinity to plus infinity of 1, used in thermodynamics and quantum mechanics.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Delta function is always a great word to know.
So is thermal conductivity. Does it mean:
the amount of heat per unit time per area that can be conducted through a plate of thickness of a given material, differing by one unit of temperature
the acceleration of a falling body in the earth's gravitational field, inversely proportional to the square of the distance from the body to the center of the earth
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