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How do icicles under a porch form?

How do icicles under a porch form? After the snow, while the roof is still covered with quite thick white snow, one can often notice...

Winter, why the breath in the mouth is white?

Winter, why the breath in the mouth is white? Athletes, after running with great effort, often open their mouths to exhale urgently. Have you noticed...

Why does water in the fat pan cause “crackling” sound?

Why does water in the fat pan cause "crackling" sound? When unintentionally letting a drop of water fall into the hot grease pan, the pan...

Why do not use water to set fire when extinguished?

Why do not use water to set fire when extinguished? Wood caught fire, can use water to throw out the fire. That is common knowledge...

Why does hot water retain heat?

Why does hot water retain heat? Pour a cup of boiling water, leave it in the air, and soon it will cool. But, if boiling...

Why fire always up?

Why fire always up? In the natural world and our daily lives, anyone can observe the burning flame is always upward, such as a burning...

Why do double-glazing have to be installed on train windows?

Why do double-glazing have to be installed on train windows? The train is a kind of long-distance transportation in today's human society. Because the train's...

Why is fur coat particularly good for keeping warm?

Why is fur coat particularly good for keeping warm? In the cold winter, people often prefer to wear fluffy coats to combat the cold. Why...

In winter, why touch iron is colder than wood?

In winter, why touch iron is colder than wood? Almost everyone knows this: winter in the outdoors, no matter how we touch the iron staff,...

Why is the fan running or manual fan feeling cool?

Why is the fan running or manual fan feeling cool? When we feel very hot in the room in the summer, we often turn on...

Why can solid corn kernels turn into crunchy popcorn?

Why can solid corn kernels turn into crunchy popcorn? Popcorn is a snack for free time, both spongy and crunchy. How was it made? Raw...

Why is it easier to peel when boiling eggs, soaking in cold water?

Why is it easier to peel when boiling eggs, soaking in cold water? Chicken eggs include hard shells and whites, soft yolks form. Normally, after...
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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...