Download e-book for kindle: Abridged Science for High School Students. The Nuclear by H. Messel

By H. Messel

ISBN-10: 0080121535

ISBN-13: 9780080121536

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Leave for a few days to see whether larger quantities of the gas in the bubbles may be collected . Test any gas collected with litmus, limewater and a lighted splinter. The purpose of boiling the water before placing the metal into it is to remove any dissolved ai r which might react with the metal. \ - F L AM E . 4 Reacti o n between metals a n d stea m Experiment 25. 1 2 . l . Place a small plug of wet glass wool or asbestos at the bottom of a test tube. Place another small piece of glass wool or asbestos about half-way up the tube.

If there are equal numbers of oppositely charged particles in a piece of material, it will behave as though it had no charge at all ; it is said to be electrically neutral. However, if there are more particles having one charge than there are having the opposite charge, the material as a whole will be charged. When the rods were rubbed with a cloth, some of the electrons were transferred from one material to the other and so the rods became charged. It can be shown that the cloth becomes charged also but that the charge is opposite to that of the rod.

You will notice on some of these levers that there are small springs which become strained when the levers are operated. When the action of the lever is finished, the stress which has been produced in the spring pulls the lever back to its closed position. The spring balances which you have used in many of your experiments are themselves operated by means of weight-forces acting on the objects being weighed. The stress produced in the spring of such a balance, because of the tensile strain, provides the upward reaction which exactly balances the weight-force, due to gravitational attraction, of the object being weighed.

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Abridged Science for High School Students. The Nuclear Research Foundation School Certificate Integrated, Volume 2 by H. Messel

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