Question

what is law of constant proportion?​

Answer 1

law of constant proportion - (chemistry) law stating that every pure substance always contains the same elements combined in the same proportions by weight.

Answer 2

According to law of constant proportion a chemical compound always consists of the same elements combined together in the same proportion by mass. this law means that whatever be the source from which it is obtained (or the method by which it is prepared) a pure chemical compound is always made up of same elements in compound.This law is given by Proust in 1779.