Matter and Its States
Passage
Matter is anything that has mass and occupies space. It exists mainly in three states: solid, liquid, and gas. In solids, particles are tightly packed and vibrate in place, giving solids a definite shape and volume. Liquids have particles that are close but can move around, giving them a definite volume but no fixed shape. Gases have particles far apart and moving freely, so they neither have fixed shape nor fixed volume. Changes in temperature and pressure can cause matter to change from one state to another?for example, water can freeze into ice or boil into steam. These changes are called physical changes, as the substance itself doesn?t change chemically. Understanding states of matter helps explain everyday phenomena such as melting ice, boiling water, or inflating a balloon.
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