Avogadro's number is a fundamental constant in chemistry, defined as approximately $$6.022 \times 10^{23}$$ particles per mole. This number represents the quantity of atoms, molecules, or other entities in one mole of a substance, providing a bridge between the atomic scale and macroscopic measurements. It plays a crucial role in converting between the number of particles and the amount of substance, linking statistical mechanics to thermodynamic properties of ideal gases.
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