Can you give me an mathematical example of a constant?

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for example in water (H2O), 2 hydrogen atoms combine with 1 oxygen atom so their mass ratio is 2;16 or 1;8, that means 1g hydrogen always requires 8g of oxygen to form the 9g of water.

pi, e, phi,1, 2, 3, 4, etc.

to make a summary of jokes

Vacuum, if maintained, is a constant as is the number 0 or zero and then there is the number 1