Why is the sky blue?
James Smith - 0
Why is the sky blue?
Have you seen, after a rain, at times the sky is as deep blue as the water of a flat...
Why is ozone hole in the polar region above?
James Smith - 0
Why is ozone hole in the polar region above?
Today, the Earth's polar region has a large hole in the air. The scientists call it...
Why the higher up, the thinner the air?
James Smith - 0
Why the higher up, the thinner the air?
You must have seen the movie climbers climb Mount Everest (Rome). Athletes wear very thick clothes, wear...
How thick is the atmosphere?
James Smith - 0
How thick is the atmosphere?
The atmosphere surrounding the Earth, the higher it goes, the more thin and thin the density, and gradually moves into...
How is the air around the Earth formed?
James Smith - 0
How is the air around the Earth formed?
Every day we live in the air, breathe the air, so how is air formed? This issue...
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What is color television?
The human eye sees an object and can see its colors because the light it emits, or light from its surface, bounces off, enters...
What is an audio CD?
Edison's phonograph underwent constant innovation to become a popular electric phonograph. It is made up of the motor, the turntable, the receiver, and the...
What is the principle of the fire detector?
Fire harms human lives and property, damages the ecological environment. Fire prevention is a matter of concern to all humans. If it is possible...
What is the principle of the theft alarm?
In important places such as money, gold, silver, underground record storage, etc., if a fraudster suddenly sneaks in. the burglar alarm will immediately sound...