101 Science Experiments - download pdf or read online

By Illa Podendorf

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Try to think of a reason why this happened as it did. You are right if you say the water evaporated from the saucer first because the air touched more of it. V 61 3. 62 Does wind help water to evaporate? Draw two squares on a blackboard. Be sure they are the same size. Make each of them wet, by rubbing them with a wet cloth. N o w fan one of them. Which dries first? T h e one which was fanned is sure to dry first. T h e wind carries the particles of water away faster t h a n the air which is not moving so fast does.

This is important because electricity goes from the positive to the negative. The positive terminal is in the middle and the negative one is on the outside. Connect a wire to a switch and to one of the terminals of one of the dry cells. Connect a wire to the other terminal on the other dry cell. Connect a wire to the other end of the switch. Now you are ready to connect the bell. You will notice there are two screws on the bell. 46 Connect one of the loose wires to one screw and the other to the other screw.

2. From which of these dishes will water evaporate first? Find a saucer, a water glass a n d a footed test tube or narrow-necked bottle. Put 2 tablespoonfuls of water in each of them. Place them side by side and let them stand. F r o m which one did the water e v a p o r a t e first? W h i c h one was second? Try to think of a reason why this happened as it did. You are right if you say the water evaporated from the saucer first because the air touched more of it. V 61 3. 62 Does wind help water to evaporate?

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101 Science Experiments by Illa Podendorf


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