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Introduction to matter and its features

Matter and its Forms

     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.

Composition of Matter

     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'.

Characteristics of Particles of Matter

     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.

States of Matter

     All matter consists of atoms and molecules. Each of these atoms and molecules has certain amount of energy.

Inter-conversion of the States of Matter

     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.

Effect of Temperature on Matter

     The temperature effect on heating a solid varies depending on the nature of the solid and the conditions required in bringing the change.

Effect of Pressure on Matter

     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.

Multiple Choice Questions

     



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