What is the law of certain dimensions?

Act on definitive dimensions, first explained at the end of the 17th century by chemist Joseph Prous, is the basis for understanding the chemical combinations of modern science. It is said that in any volume or weight the elements of the chemical compound maintain their share. For example, a commonly known chemical compound is pure water, which consists of hydrogen and oxygen in the formula of H _{2 O. The Act on Certain Dimensions says that regardless of the amount of water - whether on a glass, rain barrel or eye eye - the hydrogen ratio to oxygen. This law applies to the proportions of almost all chemical compounds. His experiments for six years were initially on metal compounds and his conclusions were different from the established science of the day. Proust's discoveries were questioned by other scientists. It is assumed that this reaction was caused by the confusion by most scientists from the 18th century about the differences between pure and mixed chemical compounds.}

One scientist who disagreed with Proust was John Dalton, who also developed his theory of multiple dimensions. Coming to the principle of another class noticed that when the compounds were made using different methods, their ratios were directly proportional to the original compound elements. He also claimed that these conditions were always expressed as integers. When the Proust law on the definitive dimensions heard, he realized that this law, in combination with the law on multiple proportions, formed the basis of the earliest atomic theory that explained the behavior of atoms under solid laws.

Today, scientists are considering a law on certain props of a critical scientific discovery. But this is not generally true. There are some chemical compounds that combine outside the strict shares of this law. In the 18th century, experiments were not as accurate as it would happen in the later centuries; The measurement was not reported with sufficient accuracy to make withThey also noticed changes among the elements known at that time. Moreover, isotopes and their effects on compounds have not yet been discovered. Exceptions to the rule may be responsible for the impact of light and severe isotopes in atomic weight analysis.