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Floating a needle on water
Thoroughly dry a steel needle. Place it on the tines of a dinner fork and gently smash the surface of the water in a dish with the fork. If you are careful the needle will float as you take the fork away. Look at the water surface closely. Can you see how the surface film seems to curve under the weight of the needle ?
what are th precuotionarymeasures signs,symbols
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Some potato cores were weighed and then placed into a dilute sugar solution. After 2 hours, they were taken out of the solution, dried on a paper towel and weighed again. The mass
What do all optical instruments and devices have in common?
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Describe the structure of the stomach. How is it modified to carry out its functions? How does It compare to that of the fetal pig?
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