Download Science and Nature

Science and Nature


Title : Science and Nature
Publish By : Britannica Learning Library 3
File : PDF
Size : 3 MB

Everything in the world is made up of molecules. Our bodies, our clothes, our houses, animals, plants, air, water, sky—everything. Molecules are so small, though, that we can’t see them with our
naked eyes.
But molecules aren’t the smallest things. Molecules are made up of atoms, which are smaller still. Atoms are so small that it takes more than a billion atoms to fill the space taken up by one pea!
The word “atom” comes from the Greek word atomos, meaning “indivisible.” But despite what their name suggests, atoms can indeed be divided into smaller pieces. Each atom has a core called a “nucleus.” Around the nucleus swarm small particles called “electrons.” The nucleus itself is made up of other small particles called “protons” and “neutrons.” And these protons and neutrons are made up of even smaller things called “quarks.” So, for now at least, quarks are among the smallest known things in the universe.

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