Lecture : The_Particulate_Nature_of_Matter
24 May 2022
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Document Summary
This word is used to cover all the substances and materials from which the physical universe is composed. There are many millions of different substances known, and all of them can be categorised as solids, liquids or gases. The kinetic theory helps to explain the way in which matter behaves. The evidence is consistent with the idea that all matter is made up of tiny particles. This explains the physical properties of matter in terms of the movement of its constituent particles. the main points of the theory are: (i) all matter is made up of tiny, moving particles, invisible to the naked eye. Different substances have different types of particles (atoms, molecules or ions) which have different sizes. (ii) the particles move all the time. The higher the temperature, the faster they move on average. (iii) heavier particles move more slowly than lighter ones at a given temperature. In a solid the particles attract one another.
