Why is the liquid level inside and outside the tube flat when the mouth has not yet inhaled from the

This is a common phenomenon in life, when the mouth has not yet inhaled from the tube, the liquid level inside and outside the tube is flat. At this time, the air pressure on the liquid surface inside and outside the tube is equal; When the mouth inhales, the air pressure on the liquid level in the tube decreases, and the air pressure inside the tube is less than the air pressure outside the tube. So, we say that the cause of this phenomenon is the result of atmospheric pressure.

Physical change: is a change in which no new matter is formed.

Solid ice melts into water when heated, and liquid water evaporates into water vapor; Water vapor condenses into water, and water solidifies into ice. In the three states of water, only the shape and state of the water have changed. No new matter is produced, so it is a physical change.

Such as diffusion, aggregation, expansion, compression, volatilization, sublimation, frictional heat generation, iron to magnet, energized heating and luminescence, activated carbon adsorption of chlorine, etc. are all physical changes.

Gasoline volatilizes and the candle melts.

Wood processing desks, iron casting into pots, ** into gold leaf.

What a bulb emits is a physical change.

This is a common phenomenon in life, when the mouth has not yet inhaled from the tube, the liquid level inside and outside the tube is flat. At this time, the tube is filled with liquid inside and outside.

The pressure of the gas on the surface is equal; When the mouth inhales air from the tube, the gas in the tube decreases, and the pressure on the liquid surface inside the tube also decreases, and the pressure of the gas on the liquid surface inside the tube is less than the atmospheric pressure on the liquid surface acting outside the tube. So, we say that the cause of this phenomenon is the result of atmospheric pressure. When drinking soda, the tube should be inserted into the soda first, when the mouth inhales, a part of the gas in the tube is sucked into the mouth, which causes the volume of the remaining gas in the tube to become larger, the pressure to become smaller, and less than the atmospheric pressure outside the tube, so under the action of the atmospheric pressure outside the tube, the soda will rise along the tube and be sucked into the mouth.

The moon follows the people.

The reason for this phenomenon is the result of atmospheric pressure. When drinking soda, the tube should be inserted into the soda first, when the mouth inhales, a part of the gas in the tube is sucked into the mouth, which causes the volume of the remaining gas in the tube to become larger, the pressure to become smaller, and less than the atmospheric pressure outside the tube, so under the action of the atmospheric pressure outside the tube, the soda will rise along the tube and be sucked into the mouth.

Because only when the internal and external pressures are the same, can the liquid be sucked up.

When drinking soda, the first thing to do is to insert the tube into the soda, and when you inhale it through your mouth, a part of the gas in the tube is sucked into your mouth

Because of the atmospheric pressure, both sides are balanced.

This is because of the relationship of atmospheric pressure.

This is to ensure that the air pressure is balanced.

Because the atmospheric pressure is different, it is originally the same atmospheric pressure, and inhalation will cause the atmospheric pressure to be inconsistent, so it will not be flat.

The pressure on the liquid surface inside the tube also decreases, and the pressure of the gas on the liquid surface inside the tube is less than the atmospheric pressure on the liquid surface acting outside the tube.

The chosen answer must be related to the theorem of knowledge you have learned, and you can't go wrong as long as you grasp this direction. This kind of question belongs to the scoring question, which can be done with a little movement of the brain.

It's all in the books.

It's OK to take a look at it before the exam.

Upstairs, everyone should be cautious about the college entrance examination.

This brother, you should have sent some information, you put an end to all these people, read it on a piece of paper every day, it won't take 10 days, you won't make a mistake, you must stick to the college entrance examination, remember to understand the memory, understand the principle, so that you can remember it older and faster, what I summarized last year are all at home and easy Come on, you must understand that learning is to have initiative

Let's summarize it seriously for yourself, and ask such questions.

Don't worry too much.

Just look good at what is in the book.

The chances of passing the college entrance examination are very small.

Just look good at what is in the book.

It's all in the exam books.

Really, just read all the common sense mentioned in the book and have an image.

Don't look at the "survival passbook", if you really remember it like this, you will finish the college entrance examination physics. Just look at what appears in the book, and then take a piece of paper and write it down, as if... I don't remember much content, so it's good to read it when I have time, it's easy to remember.

Take it easy, the college entrance examination is nothing, you will know after the exam.

There is no need to memorize the information for these 5 points!! Isn't it just the 5 points?

In high school physics, these people are limited to a certain field, such as: Newton, as soon as he mentions mechanics, he thinks of mechanics. Maxwell - electromagnetic. ......Then it is easy to solve it with elimination.

It's like popular science knowledge to memorize.

Buy two more materials.

Do more questions like this.

Go long and you're good to go.

That's all there is to the exam.

And it's related to what you're learning.

There is nothing difficult about it, the chosen answer must be related to the theorem of knowledge you have learned, as long as you grasp this direction, you will not go wrong. This kind of question belongs to the scoring question, which can be done with a little movement of the brain.

The points are all practiced, do more questions, and if you do more, you will have experience. Good luck!

It could be your psychological problem.

I feel that this question is very simple, listen carefully in class, and do not need to take notes.

Just take a look after class, don't push yourself too hard. There won't be nothing, don't think too much, relax the choice, don't care too much.

Don't blame yourself either.

Sometimes I also reply

Hehe, take it easy, don't think about it right or wrong.

Read more, read more, read more!

A very, very effective approach!!

Not only the symptoms, but also the root causes!

Physics questions are generally based on the basic concepts and some formulas in the book, it is recommended that you usually read more textbooks, and it is best to fully understand the questions you have done wrong, and write a collection of mistakes to record.

Use the elimination method, first fork out what you think is wrong, and then guess the rest if you really don't know, but there will definitely be a better hit rate, come on, in fact, it's good to take it easy, and it won't be too difficult for the candidate's college entrance examination.

Watch "100,000 Whys", there are some in the book!

Pay more attention to the things around you, and you will know when you are in contact with them.

It's very simple, memorize all the definitions that are often mentioned in the book, and you're basically OK.

Generally, the teacher will summarize the knowledge points, mind the knowledge points, and then copy them in a notebook, and then the memory effect will be better.

At first, the pressure of the air in the straw is equal to the atmospheric pressure. Before sucking water into the mouth, the mouth first sucks out the air from the straw (as if vacuuming) to reduce the pressure in the straw next to the mouth. The atmospheric pressure is constant, and the atmospheric pressure is greater than the customary pressure of a vacuum on the side of the mouth, so the water is pressed into the mouth.

The position where the atmospheric pressure is applied at this point is the surface of the liquid in the cup.

Put the straw into the cup first, the liquid level of the cup is the same as the liquid level of the straw, the mouth sucks the drink, the pressure in the mouth is less than the atmospheric pressure, the liquid level (open) of the cup is only affected by atmospheric pressure, so the pressure of the liquid in the straw is less than the pressure of the liquid level of the cup, so that the liquid level of the straw rises, and you drink the drink from the straw.

When inhaling, the air pressure inside the straw and the air outside the straw create a difference in air pressure, which causes the drink to rise.

Changes in temperature, shape, and state of matter are all common.

Water vapor, liquid – gaseous.

Ice melt water is solid --- liquid.

Anyway, it is the mutual conversion between solid, liquid and gaseous.

Solid becomes liquid in gaseous state.

The liquid state becomes the solid gaseous state.

The gaseous state becomes a liquid solid.

Because of the atmospheric pressure, the air in the straw is sucked away, and the air from the outside will be replenished, so an upward force will be formed, and when you insert the straw into the water, the specific gravity of the water is greater than that of the air, so the water will be sucked up.

When the straw is inhaled, the atmospheric pressure inside the straw decreases, and the part of the surface of the soda outside the straw is squeezed into the mouth by atmospheric pressure, and it is sucked up.

When the mouth has not yet inhaled from the tube, the liquid level inside and outside the tube is flat. At this time, the pressure of the gas on the liquid surface inside and outside the tube is equal; When the mouth inhales air from the tube, the gas in the tube decreases, and the pressure on the liquid surface inside the tube also decreases, and the pressure of the gas on the liquid surface inside the tube is less than the atmospheric pressure on the liquid surface acting outside the tube. So, we say that the cause of this phenomenon is the result of atmospheric pressure.

When drinking soda, the tube should be inserted into the soda first, when the mouth inhales, a part of the gas in the tube is sucked into the mouth, which causes the volume of the remaining gas in the tube to become larger, the pressure to become smaller, and less than the atmospheric pressure outside the tube, so under the action of the atmospheric pressure outside the tube, the soda will rise along the tube and be sucked into the mouth.

Principle of pressure. When you suck. The air inside the tube is sucked out.

The internal pressure of the tube is less than the external pressure. At this point, the outside atmospheric pressure will press the liquid into the tube to keep the pressure balanced. You can do a simple test.

If you poke a hole in the straw. If you're sucking, you can't suck it up.

You suck the straw so that the air pressure inside the straw drops, and the atmospheric pressure outside the soda pushes the soda down the straw until it reaches your mouth.

In fact, there is no rule that you can't drink hot coffee with a straw, just to prevent it from being hot, have you ever seen a heated soda, of course, I won't worry about burning it with a straw.

Because the straw is made for drinking soda, it must be able to drink soda, or it won't be called a straw.

It helps you control your amount so that you don't choke.

The water evaporates into water vapor, which becomes rain.

Carbon dioxide and water are synthesized into organic matter under photosynthesis and are our food and energy.