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When we perceive of something as being 'hot,' it is because the atoms in the material are moving rapidly. The dropping of the atom bomb on Hiroshima signaled the beginning of an era in which man has become capable of destroying all life on our planet. In science, each element is composed of a different type of atom. The United States conducted its first test of an experimental atomic bomb at 5:30 a.m. In March of 1950, the Soviet Union announced it had built an atomic bomb. Many people in this country have reservations concerning the safety of atomic energy.Īn atomic clock is accurate to within 1 second in 1.7 million years.Įvery second, a hurricane releases as much energy as the explosion of a Hiroshima-type atomic bomb. Scientist Amaeo Avogadro first distinguished molecules from atoms in 1811.Ītoms and molecules are too small to directly measure.
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