Important and convenient derived quantities such as densities, fluxes, flows, currents are associated with many quantities.
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Scalars: Symbols for physical quantities are usually chosen to be a single letter of the Latin or Greek alphabet, and are printed in italic type.
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Physical constant, a physical quantity generally believed to be universal and unchanging
It implies that a physical quantity is conserved if its Poisson Bracket with the Hamiltonian is zero and it does not depend on time explicitly.