![]() However, the mass of the wood actually does not disappear it is just converted into the mass of gases, mainly carbon dioxide. For example, the mass of wood seems to disappear when it is burned. Until then, in many instances mass seemed to appear or disappear. Historically, the conservation of mass and weight was kept obscure for millennia by the buoyant effect of the Earth's atmosphere on the weight of gases, an effect not understood until the vacuum pump first allowed the effective weighing of gases using scales. ![]() What lead to Dalton’s atom hypothesis? The first discovery that was important to the development of modern atomic theory was the law of the conservation of mass by Antoine Lavoisier (Fig. , )Īlthough the atomistic idea was already known in the antique, it became forgotten for a long time and was only reintroduced about 2000 years later with Dalton’s atom hypothesis. (Attribution: Louis Jean Désiré Delaistre (1800–1871) drawing by Julien Léopold Boilly (1796–1874). Modern Atomic Theories Figure 1.1.4 Antoine Lavoisier, the father of modern chemistry, discovered the law of conservation of mass in 1774. This question would not be answered until about 2000 years later. However, Leukippes and Democrites did not know how many different elements there were, and how different atoms of different elements were actually distinguished. Atomistic element theory allows for many different elements which helps to explain the complexity of the material world satisfactorily. Ultimately, after many divisions, one would arrive at particles that could not be further divided, and these particles would be called atoms. They assumed that particles cannot be divided into smaller particles infinitely often. The first greek philosophers that introduced atomistic element theory were Leukippes, and Democrites (Figure 1.1.3). This means that they did not include the idea that elements were made of small particles that were indivisible. The element theories of Thales, Anaximenes, Heraklitus, and Empedocles were all non-atomistic. \)įirst atomistic ideas Figure 1.1.3 Democrites (460 – 370 BC) (Attribution: Strannik 92 )
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