3. GASES 3.1 STATES OF MATTER Matter exists in four states i.e., solid, liquid, gas and plasma. The simplest form of matter is the gaseous state and most of matter around on is in the solid state. Liquids are less common than solids, gases and plasmas. The reason is that the liquid state of any substance can exist only within a relatively narrow range of temperature and pressure. Let us look at the general properties of gases, liquids and solids. Kinetic molecular theory of gases can help us understand their properties. 1. Gases don't have a definite volume and occupy all the available space. The volume of a gas is the volume of the container. 2. They don't have a definite shape and take the shape of the container just like liquids. 3. Due to low densities of gases, as compared to those of liquids and solids, the gases bubble through liquids and tend to rise up. 4. Gases can diffuse and effuse. This property is negligible in solids but operates in liquids as well. 5. Gases ...
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