Amazing Leonardo da Vinci Inventions by Maxine Anderson

Author:Maxine Anderson
Language: eng
Format: epub
Publisher: Nomad Press
Published: 2006-03-12T05:00:00+00:00

What to do

1 Cut the tops off the milk cartons so you have two equal-sized containers.

Cut the tops off both cartons

2 Melt a thin coating of wax on the bottom of one container.

3 Poke holes in each side of the containers and thread string through them.

Coat the bottom of 4 one carton with wax

4 Tie the string ends to the ends of the coat hanger, so one container is at each end.

Poke a hole in each side

5 Put some cotton balls or a sponge in the container without the wax coating.

6 Hang the hanger outside where it won’t be affected by wind, then add more cotton or pieces of sponge to the second container so that the two containers are level and balanced.

7 Leave your hygrometer outside, checking it every ten minutes to see if the container with the cotton or sponge has grown heavier than the container with the wax. If the container with the sponge or cotton balls has grown heavier, it means the humidity level of the air is rising—the higher the humidity, the more water vapor in the atmosphere.

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