Publisher's Synopsis
Excerpt from Forty Lessons in Physics
Sizes. - A drop of water (fig. 1) is of the size called a mass. Imagine the drop divided into two drops, each Of these into two drops, each of these into two drops, and so on indefinitely. By and by, long after the particles are too small for the eye to see, even when aided by the most powerful microscope, the smallest possible particle of water would be obtained. This particle is called a molecule. By a chemical process the water molecule can be subdivided into three parts, - two of hydrogen and one of oxygen. These particles of hydrogen and oxygen are called atoms.
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