MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY MIKKEL JUUL JENSEN / SCIENCE PHOTO LIBRARY
States of matter. Computer illustration showing the three states of matter and how any one of them can be converted (arrows) directly into one of the other two - by an increase or reduction of energy in the form of heat. Clockwise from: gas, liquid and solid. Molecules are in constant motion. In solids, the molecules have a strong attraction, are close together and have limited motion. In a liquid, the molecules have more energy, which enables them to overcome some of the attraction and move more freely. In a gas, attraction between particles is minimised and they move freely throughout the container.
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