AIR
Air is here, there, and everywhere. It is invisibly and it does not small or taste, so how can you prove that it exists? Does it change? Can it move? What is it made of?
What is air? Is it a substance, or is it nothingness? Air is all around you, but you cannot see it. Does air have weight? Does it take up space?
Air is made up of gases. Gases are invisible. All gas particles are pulled toward the Earth by the force of gravity.
The particles of gases that make up air have lots of kinetic energy. The moving particles collide with each other with enough force to create relatively large spaces between particles. Because of this free flowing space, air like other gases can be compressed. Extra air can be squeezed into a container so the air pressure inside the container becomes greater.
AIR TAKES UP SPACE!!Even though you cannot see it, air takes up space. One method to test this theory is by placing a balloon into a bottle. The bottle is full of air. When you blow, the balloon will inflate a little as the air trapped inside the bottle is compressed (squeezed into a smaller space). When the compressed air begins to push back as hard as you are blowing in (air pressure equals the pressure you are applying), the balloon cannot get any bigger.
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COMPRESSED AIR |
CAN AIR SUPPORT SOLID OBJECTS IN SUSTAINED FLIGHT?
Have you ever been out walking on a windy day? Think about what is taking place around you. Have you seen dust particles flying through the air, plastic bags. What else might you have seen?
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Sometimes air can be so strong that it creates a sand storm or a dust storm. A dust storm is a severe windstorm that sweeps clouds of dust accross an extensive area.
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