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Read e-book online 101 Science Experiments PDF

By Illa Podendorf

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Extra resources for 101 Science Experiments

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Leave a b o u t a foot of wire at this end too so t h a t it c a n be used for connections. Twist the two wires firmly together close to the bolt. Now you are ready to connect u p your magnet. Push the cotton back f r o m the ends of the wire so that the copper shows. Twist one wire around one terminal of a dry cell. Twist the other wire around the other terminal. Now see whether you can pick up paper clips with your electric magnet. You should be able to pick up several paper clips. Now loosen one of the wires from the dry cell and see w h a t h a p p e n s to the p a p e r clips.

Connect u p your electric m a g n e t as you did in experiment No. 7 a n d find out which pole is the N pole a n d which pole is the S pole. Remove the wire from the middle terminal of the dry cell. N o w remove the wire from the other terminal and put it on the middle one. Now put the other wire on the outside terminal. Find out which pole is now the N pole and which pole is the S pole. You are sure to have discovered that the poles have been changed. Try this experiment again and see whether the poles have been changed back again.

These drops of water came from the air. T h e little molecules of water in the air collected into little drops of water. We say t h e water condensed. This sometimes happ e n s w h e n y o u a r e a b o u t to d r i n k a cold glass of lemonade. You notice drops of water on the outside of the glass. 64 6. Will water expand (take up more space) when it is heated? Use a flask, a one-hole r u b b e r stopper with a glass t u b e t h r o u g h it. Fill t h e flask with water, coloured with a little food colouring.

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101 Science Experiments by Illa Podendorf

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