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Democritus did coin another important word: atom. He referred to the small particles that make up everything in the universe as atomos
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Newton suggested that when particles of light end up in a medium, such as air or water, they are attracted to the particles of that medium due to an attractive force (gravity) between the particles.He wasn't able to prove it compleatly.
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Dalton believed atomic theory could also explain why water absorbed different gases in different proportions—for example, he found that water absorbed carbon dioxide far better than it absorbed nitrogen.
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This was first demonstrated by Albert Einstein's Theory of Special Relativity and famously expressed in his iconic equation, E=mc2, where E stands for energy, m for mass and c for the speed of light (squared).
