A tag is a keyword or label that categorizes your question with other, similar questions. Using the right tags makes it easier for others to find and answer your question.

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solid materials that contain interconnected pores allowing fluids to pass through.
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a measure of how much of an object is made of elements besides hydrogen and helium.
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the electromagnetic shock-wave due to a charged particle traveling through a medium faster than the speed of light in that medium.
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Thermal Field Theory or Finite Temperature Field Theory deals with of methods to calculate expectation values of physical observables of a Quantum Field Theory at finite temperature.
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equalities involving the mixed second partial derivatives of thermodynamic potentials.
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the distance over which significant charge separation can occur in a conductive material or plasma due to a variety of effects.
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