What is the science behind not being able to suck a drink with two straws?

The principle of drinking drinks through a straw is that the air pressure in the tube is lower than the outside atmospheric pressure. The liquid pressure in the beverage tube is n1, the upward force of the drink at the bottom of the straw is n2, the initial gravity of the liquid in the tube is m1g, and the liquid gravity is m2g when the tube is full. The straw is placed in the drink, and the liquid at the bottom of the straw is counteracted by the force in all directions, and the liquid is stationary.

n1+m1g=n2。When the straw is sucked, the surface pressure n1 of the beverage tube decreases, and to make the equation stand m1g to increase, the liquid flows upward.

Straw making:

Production method: After the plastic is melted, it is passed through the extrusion mold, which is the so-called mouthpart, and then the machine extrudes the plastic like a syringe (this process is continuous, there is a screw on the machine, which will be extruded at a certain speed), and when the plastic is still soft, it is sent to the machine, directly molded, and then cut by the machine in the later stage, which becomes the straw we see a piece by piece.

Attention Issues:

The straw may be processed from waste plastics, and once exposed to high temperatures, toxic substances will be produced and harmful to health. There must be a problem with the quality of the straws, because they are made of inferior or recycled plastic, and pigments may be used to cover impurities. Once you use it to drink juice or hot drinks, harmful substances will dissolve with it, causing harm to the human body.

Drinking and playing can show the true colors of science experts. Guess what, a cold drink, plug in a straw, can you drink it? With another straw, can you still drink it?

What is the answer? Try!

You'll need: 2 plastic straws and 1 drink (drinking water is fine).

Procedure: Step 1: Pour the drink into a cup and suck the drink through a straw. Don't suck it all in one sitting!

Step 2: Add another straw and place one end of the second straw in your mouth and the other end outside the cup. Use two straws to suck the drink together.

Step 3: Plug one end of the second straw with your hand and try to suck the drink again.

Step 4: Repeatedly block and release one end of the second straw, what is the difference in comparison?

Demystifying: When the second straw is released, the drink can't be sucked. And when we plugged the second straw, the drink was sucked up again. Is this your result?

When we suck a drink with just one straw, it is easy to suck the drink into the mouth, this is because the air pressure in the mouth is reduced by sucking through the mouth, and the atmospheric pressure outside is greater than the air pressure in the mouth, which presses the drink into the mouth.

If you put a second straw in your mouth but don't put the other end in your drink, you won't be able to drink because the air will go through the second straw into your mouth and the air pressure in your mouth won't decrease. When the second straw is blocked, it also prevents air from entering the mouth from the second straw, and the pressure in the mouth will still be reduced, so that you can drink the drink.

Yes, sucking a drink into a cup with a straw does take advantage of the principle of atmospheric pressure. When you drink a drink through a straw, your mouth will close the straw and then inhale to reduce the air pressure inside the straw. At this point, atmospheric pressure decay will act on the surface of the drink in the glass, causing the drink to be pushed into the straw.

When the air pressure inside the straw is lower than atmospheric pressure, the drink will rise down the straw and into your mouth.

Think of it this way: the air pressure inside the straw decreases, and the atmospheric pressure creates an upward thrust on the surface of the drink, pushing the drink into the straw. In this process, we do not "suck" the drink up by suction, but use the atmospheric pressure difference to push the drink into the straw.

This is also the reason why in a vacuum, it is not possible to drink drinks with a straw. In a vacuum, there is no atmospheric pressure, so it is not possible to create a pressure difference between the wheels that push the drink into the straw.

Drinking drinks through a straw makes use of the principle of atmospheric pressure.

Inhaling through a straw will reduce the pressure in the tube, and the drink will be pressed into the mouth under the pressure of the atmospheric sensitization setting. As the liquid decreases, the depth h of the liquid in the cup decreases, and the density of the liquid g remains unchanged, and the pressure of the liquid in the cup on the bottom of the cup will become smaller by the liquid pressure formula P= Gh, and then the air pressure outside the straw will press the liquid into the straw.

Atmospheric pressure is the atmospheric pressure acting on a unit area, i.e., equal to the weight of the vertical column of air that extends up to the upper boundary of the atmosphere per unit area. The magnitude of the air pressure is related to the altitude, temperature and other conditions, and generally decreases with the increase of altitude. In the horizontal direction, the difference in atmospheric pressure causes the movement of air.

The concept of air pressure

Atmospheric pressure refers to the weight of the atmospheric column per unit area, and is commonly expressed in millibars or millimeters of mercury column height in meteorology. A standard atmospheric pressure is millibar, or the equivalent of a column of mercury 760 mm high. Since the higher the air pressure above the ground, the lower the air pressure, so the altitude can be measured based on the change in the vertical direction.

In the horizontal direction, the difference in air pressure can cause the flow of air, so it is one of the important meteorological elements for analyzing weather forecasts.

From the point of view of the molecular motion of air, it is the result of the combined action of the molecular motion of the air and the gravitational field of the earth. Under the combined effect of this combination, the impact force exerted by many air molecules on the plane of the unit surface of the product is expressed as air pressure at every instant.

a.Centrifugal force conducts electricity.

b.Atmospheric pressure.

Correct answer: B

When we drink water with a straw, when we suck in the mouth, we suck out the air in the straw, which causes the air pressure in the straw to be smaller than the air pressure outside the straw, and then the air pressure outside the straw will press the water into the straw to make a mountain, and we will drink water.

There's a concept involved in this, atmospheric pressure. Due to the force of gravity, the air exerts pressure on the object immersed in it, that is, atmospheric pressure, or barometric pressure for short. Since the air is fluid, it will have pressure in all directions.

At the same point, the air in all directions is only strong in the pressure of the slag, and the small phase is pure, etc.

Sucking a drink through a straw is the use of atmospheric pressure. When you use a straw to suck the Ant Pie drink, the pressure in the tube will be reduced when you inhale, and the drink will be pressed into your mouth under the action of the pressure of the Great Defeat Gas. As the liquid decreases, the depth h of the liquid in the cup decreases, and the density of the liquid g remains unchanged, and the pressure of the liquid in the cup on the bottom of the cup will become smaller by the liquid pressure formula P= Gh, and then the air pressure outside the straw will press the liquid into the straw.

A straw is a cylindrical, hollow plastic or paper product that is mainly used to drink beverages in cups. Generally, the diameter is around the center.

However, when it is used to smoke drinks such as yogurt and bubble tea, a thicker straw will be used, and some of them have a diameter. Some, less common, very small diameter straws are used to drink hot beverages.

When you suck a drink through a straw, you use atmospheric pressure to press the drink into your mouth. When the straw sucks the drink, when inhaling, the pressure in the tube decreases, and the drink is pressed into the mouth under the action of atmospheric pressure; With the decrease of the drink in the cup, the depth h of the liquid in the cup decreases, and the density of the liquid remains unchanged, according to the liquid pressure formula p= gh, it can be seen that the pressure of the liquid in the cup on the bottom of the cup will become smaller, and then the air pressure outside the straw will press the water into the straw until the mouth.

A straw, or straw, is a cylindrical, hollow plastic product, whose main function is to drink the drink in a cup, and also to suck the bone marrow of some cooked animal bones.

Generally, the diameter is about the same, but when it is used to smoke drinks such as yogurt and bubble tea, a thicker straw is used, and some have a diameter. Some, less common, very small diameter straws are used to drink hot beverages.

When you suck a drink through a straw, you use atmospheric pressure to press the drink into your mouth. When the straw sucks the drink, when inhaling, the pressure in the tube decreases, and the drink is pressed into the mouth under the action of atmospheric pressure; With the decrease of the drink in the cup, the depth h of the liquid in the cup decreases, and the density of the liquid remains unchanged, according to the liquid pressure formula p= gh, it can be seen that the pressure of the liquid in the cup on the bottom of the cup will become smaller, and then the air pressure outside the straw will press the water into the straw until the mouth. <

When you suck a drink through a straw, you use atmospheric pressure to press the drink into your mouth. When the straw sucks the drink, when inhaling, the pressure in the tube decreases, and the drink is pressed into the mouth under the action of atmospheric pressure; With the decrease of the drink in the cup, the depth h of the liquid in the cup decreases, and the density of the liquid remains unchanged, according to the liquid pressure formula p= gh, it can be seen that the pressure of the liquid in the cup on the bottom of the cup will become smaller, and then the air pressure outside the straw will press the water into the straw until the mouth.