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By H. Messel

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It seems that heat must increase the motion of the particles. Can we test this idea? If heat does increase the motion of the particles we might expect hot materials to diffuse more quickly than cold ones. The following experiment might provide an answer to this problem. 8. Into each of two test tubes pour some warm gelatin solution. Follow the directions on the packet to make up this gelatin. The tubes should be about half full of the solution. Stand them upright until the jelly has set. Make up a coloured solution by dissolving some potassium dichromate in water and adding potassium hydroxide until the solution turns yellow.

Yet all this, awe-inspiring as it may be, was simply told to you as things that scientists have discovered. In this chapter we are going to do something entirely different. We are going to guide you through some simple observations of the heavens which you yourself can make. But, to really understand and appreciate this chapter, you must take yourself outside and use your eyes or a camera, to observe for yourself the fascination and wonder of the heavens. We often speak of building something from the ground up; and that is how we usually do build things.

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. (d) Some molten iron sets in a mould. (e) A custard is changed into ice cream. ( / ) Water is taken into the air from the ocean and later falls as rain.

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Abridged Science for High School Students. The Nuclear Research Foundation School Certificate Integrated by H. Messel


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