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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an unstable exotic atom bound state consisting of an electron and its anti-particle, a positron. The orbit and energy levels of the two constituent leptons are analogous to, but si…
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The average length that a molecule will travel in a fluid before colliding with another molecule.
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the disk around a compact star that accumulates matter from e.g. a companion star by the Roche lobe overflow or stellar wind transfer.
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a vast field of research at the interfaces between physics, chemistry and biology. It consists in the study of the physical properties of composite objects described by a characteristic…
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the problem of finding the path between two points such that the transit time under specified conditions is minimized.
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Condition for the angles for coherent and incoherent scattering from a crystal lattice, summarizing the diffractive interference pattern dictated by the geometry of the lattice. Normally for Rayleigh …
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a measure of how much of an object is made of elements besides hydrogen and helium.
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Fermi liquid theory (also known as Landau–Fermi liquid theory) is a theoretical model of interacting fermions that describes the normal state of most metals at sufficiently low temperatures. The pheno…
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In fluid dynamics, potential flow describes the velocity field as the gradient of a scalar function: the velocity potential.
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Osmosis the the movement of molecules through a permeable membrane barrier. It occurs as the molecules of a solvent stabilize the concentration of solute particles on either side of the barrier. Osmos…
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equalities involving the mixed second partial derivatives of thermodynamic potentials.
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Use for atomic clocks - not any other type of clock.
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