Here is a way to show that hot and cold molecules move at different speeds. A hot-and-cold contest Materials - bowls (2, large) - food coloring - medicine dropper - pan (bigger than bowl) -...
Making changes
You can change matter from one form to another by making molecules speed up and slow down. This project will show you how. A melting race Make sure the glasses are at room temperature. Put an ice...
Slowing down molecules
In stormy weather, raindrops trickle down the outside of the window. But sometimes, in very cool weather, the inside of the window is cloudy and wet. Where does the film of water on the inside of the...
Speeding up molecules
Can you fry ice cubes? You can try---but if you heat ice cubes in a pan, they won't be ice cubes any more. The ice will melt into water. And, after a while, the water will boil and turn into steam....
Hard, wet, and invisible
Which is strongest---a stone wall, running water, or blowing wind? A stone wall can stop the wind. But running water can wear down a stone wall. And moving air in the wind can dry up water. So, each...
Putting energy to work
You can water your garden by holding the hose and spraying the water where you want it to go. But if you do this, you have to stand there until the garden is watered. There is another way---a better...
Energy from the wind
A push from the wind can make a kite fly and a sailboat glide across the water---and it can do other things, too. It can even light lamps and pump water! If you live in a place where a strong,...
Drum bank
Materials - clay (hardening) - knife - pan - pencil - plate (small) - rolling pin - ruler - toothpick - water - wood (two strips of equal thickness) Next, measure and cut out a large...
Eskimo finger mask
Materials ■ clay (hardening) ■ glass (small) ■ pan ■ water Read about hardening clay (page 108) before you start this project. 1 To make the face part, break off a lump of clay and flatten it...
Coil pot pottery
Materials - clay (hardening or chemical) - small dish ■ toothpick ■ water Read Clay (pages 108-110) before you decide what kind of clay you want to use for this project. 1. Break off a lump...