Abridged Science for High School Students. The Nuclear by H. Messel


By H. Messel

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Extra resources for Abridged Science for High School Students. The Nuclear Research Foundation School Certificate Integrated

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When a gas is cooled sufficiently the particles lose energy, move more slowly and come closer together to form a liquid. This change of state is called condensation. 4. Further cooling of a liquid, thus removing heat energy, causes the particles to slow down when cooled sufficiently so that the particles vibrate to and fro but do not migrate. The liquid has changed to the solid state. This change of state is called solidification. TEMPERATURE The temperature of a body is a measure of how hot it is and depends on the average energy of its particles.

He asks the attendant to check the tyre pressures. What is he likely to find out about these pressures and can you explain why this has happened? 8. Describe what takes place in the movement of particles when air in a sealed container is heated from 20 °C to 80 °C. Would you expect the particles in this container to be further apart at 80ûCthanat20°C? (a) Washing dries on a line in summer. (b) The same thing in winter on a mountain area when the clothes are " frozen like boards ". (c) Some water placed in a saucer vanishes into the air.

We have found a common form of matter which can exist in three states. Heat is involved in changing from one state to another. 1 Ice, water and steam are the solid liquid and gas states of water state melts when it is heated, forming a liquid. A liquid boils when it is heated to form a gas or vapour. Cooling the gas—taking heat away from it—causes it to condense back to a liquid, which may be further cooled until it freezes to a solid. 1. Perhaps you are wondering if water is the only form of matter that can exist in the three states of solid, liquid and gas.

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