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The '''law of definite proportions''' states that the proportion of [[element]]s in any [[compound]] is always the same.<ref>WordNet: [http://wordnetweb.princeton.edu/perl/webwn?s=law%20of%20definite%20proportions Law of definite proportions]</ref> For example, 1 drop of [[water]] and 1 million [[gallon]]s of water each have the same ratio of [[hydrogen]] to [[oxygen]] (that is, 2:1).

The '''law of definite proportions''' states that the proportion of [[element]]s in any [[compound]] is always the same.<ref>WordNet: [http://wordnetweb.princeton.edu/perl/webwn?s=law%20of%20definite%20proportions Law of definite proportions]</ref> For example, 1 drop of [[water]] and 1 million [[gallon]]s of water each have the same ratio of [[hydrogen]] to [[oxygen]] (that is, 2:1).