Wikipedia: Law of multiple proportions

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Simply put, for any two substances containing a given element,
the mass proportion of that element in the substance is a ratio of
small whole numbers.

Two elements which form more than one compound between them will have
compounds whose mass ratio between the two elements are related to each
other as a ratio of small whole numbers.

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For example, for two oxides? of carbon, the relative
proportion of oxygen is the ratio? of 1:2 (for carbon monoxide
and carbon dioxide).

For example, considering two of the carbon oxides: CO and CO₂.

In the first, the ratio is 1/1 and in the second 1/2. The ratio
between these ratios is a ratio between small whole numbers, or

1/1 : 1/2 = 2:1

In chemistry, one of the basic laws of stoichiometry, alongside the law of definite proportions.

Two elements which form more than one compound between them will have compounds whose mass ratio between the two elements are related to each other as a ratio of small whole numbers.

For example, considering two of the carbon oxides: CO and CO₂.

In the first, the ratio is 1/1 and in the second 1/2. The ratio between these ratios is a ratio between small whole numbers, or

     1/1 : 1/2  = 2:1