Avogadro's constant is the number of atoms or molecules of a substance in 1 mole of that substance.
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Avogadro's number is a constant and is the same regardless of element.
Avogadro's number is the number of atoms in a mole. This is a physical constant, not a mathematical one.
A mole.
The Loschmidt constant, NL is related to Avogadro's number, NA by the relationship:NL = p0*NA/(R*T0) wherep0 is the pressureT0 is the thermodynamic temperature andR is the gas constant.
Constant just means that the number does not change. For example, in Chemistry, avogadro's number is 6.022x10^23 and that number will never change, therefore it is a constant.