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Additional resources for Abridged Science for High School Students. The Nuclear Research Foundation School Certificate Integrated, Volume 1
The solid state we know as ice, the liquid state as water. When ice melts to form water or water freezes to form ice, the change is called a change of state. Are melting and freezing the only changes of state? Continue to heat the water in the test tube until it boils. Notice that the level of the water in the tube falls rapidly. Where does the water go? 1, you will soon see drops of water forming. In the clear space between the water in the test tube and the drops of water on the watch glass, there is water existing in a third state.
4 The solid, liquid and gas states of matter can be thought of as made up of particles in constant motion Scientists picture solids as something like a fidgety class. While the particles keep their positions, they just will not keep still, but constantly jiggle about, or vibrate. They have had to add this idea to the particle picture of a solid for reasons you will learn about later. We shall include this idea to give us a more complete picture. Let us stand back and have a look at our ideas about matter:— • We see a solid as made up of particles almost touching one another, keeping the same positions but constantly vibrating.
The closer the lumps become, the less space there is left to squeeze them into and so it becomes more difficult to compress the gas. If this seems a reasonable explanation to you, we might keep it for the time being. However, it might be better to use another word for the lumps of matter in a gas and call them particles. If you are prepared to dry out the pump after using it, you could use it to find out if liquids are compressible. Water is a convenient liquid to use, but you could test kerosene or oil or any other liquid.
Abridged Science for High School Students. The Nuclear Research Foundation School Certificate Integrated, Volume 1