Why Does Dew Fall Overnight?
Dew is the result of condensation on the surface of the earth. At night the earth sometimes becomes colder than the air, and when…
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Air
What Makes the Wind?
Wind is the movement of air across the surface of the earth, caused by warm air rising and being replaced by cooler air. Except…
What Is Twilight?
Twilight is the faint light which appears a little before sunrise and again after sunset before it gets really dark. On the Moon there…
How Do Vertical Wind Tunnels Work?
The invention of large machines called vertical wind tunnels launched an entirely new sport: indoor skydiving! After donning a jumpsuit, goggles, a helmet, and…
What Is a Bunsen Burner?
A Bunsen burner is a gas burner consisting of a tube with a small gas jet at the lower end and adjustable air inlet by means of which the he