Why do think a 10 kg iron ball weighs 10kg where ever its place of origin be.
like wise avagardo no is also constant.
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Such a number is called a "constant". If the number appears in front of a variable, it is sometimes called a "coefficient".
A number with a power is still a number - a fixed constant. The differential of a constant is always 0.
It means something that doesn't change, like a number.
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.
Avogadro's constant is the number of atoms or molecules of a substance in 1 mole of that substance.