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An aneroid barometer
The corrugated rubber tube from a gas mask, or a cycle grip, can be used to make a model aneroid barometer. No huge accuracy is to be expected due to the many possible errors.
Two good corks or pieces of non-porous wood are required to close the ends of the tube, which serves as a vacuum box. They are fitted when the rubber is compressed and they should be made airtight with wax and by tying string round the exterior of the rubber.
Minerals: Our bones and teeth contain large amounts of calcium. An adult has a total of about 1 kg of calcium and a baby has about 30g in their bones. So, during the period o
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describe the factors which decide the broad area of scientific activity
can you explain to me the mohs hardness scale ?
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