The law of definite proportion : A chemical compound eternally holds exactly the same proportion of elements by mass. This sometime also called Proust's Law.
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SIMPLY WE CAN SAY a chemical substance the elements are present in definite proportion by mass.also called law of constant proportion.
The law of definite proportion or constant proportion states that in a chemical substance all the elements are always present in a fixed H and O combine in the ratio of 1:8 to form water.