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Matter and its Forms |
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Take a look at your surroundings. You may find a pencil, a book, an apple, a table or a chair. Can you feel the air blowing? These are different forms of matter. |
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Composition of Matter |
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Intensive investigation by scientists over the years led to the development of a mental model (the minuscule particles couldn't be actually seen at that time) known as 'dynamic particle model'. |
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Characteristics of Particles of Matter |
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According to the dynamic particle model all states of matter are made up of tiny particles and matter as a result is an aggregation of very small particles. |
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States of Matter |
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All matter consists of atoms and molecules. Each of these atoms and molecules has certain amount of energy. |
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Inter-conversion of the States of Matter |
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Depending on the conditions of temperature and pressure, matter can exist in any of the three main states i.e., solid, liquid or gas. Matter can be inter-converted from one state to the other by the addition or removal of heat energy. |
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Effect of Temperature on Matter |
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The temperature effect on heating a solid varies depending on the nature of the solid and the conditions required in bringing the change. |
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Effect of Pressure on Matter |
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Pressure has little effect on the state of solids and liquids as the inter-particle distance is already minimized in these situations. However, the effect of pressure in case of gases is considerable. |
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Summary |
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Evaporation is a surface phenomenon of liquid changing into vapour that causes cooling. |
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Question and Answers |
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Multiple Choice Questions |
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