w,the pressure in the straw is reduced.but the atmospeheric pressure on the surface of the liquid stays the same.
This is significant as the drink moves up the straw and into your mouth.
Sucking on the straw reduces the air pressure inside it. This allows 'natural' air pressure to push down on the liquid in the container, causing it to rise up the straw..
The straw would displace the water in the cup, causing the water level inside the straw to rise above the water level in the cup due to atmospheric pressure. The water would remain at a stable height as long as the straw remains in the cup.
Air pressure pushes down on the liquid inside the helio straw, causing it to rise when the pressure is reduced by sucking on the straw. This creates a vacuum effect, allowing the liquid to flow up the straw and into your mouth.
If you suck some air out of a straw, the remaining air in the straw will have to contract in volume in order to maintain the same pressure, which it will do because normal air pressure is still pressing on the liquid in which the straw is submerged. The contracting air will then draw up the liquid.
This is significant as the drink moves up the straw and into your mouth.
Drinking through a straw creates a suction that lowers the pressure inside the straw. This decrease in pressure compared to the higher pressure outside the straw causes the liquid to be pushed up and flow towards the lower pressure area inside the straw. This demonstrates the principle that fluids naturally flow from areas of high pressure to areas of low pressure to equalize the pressure difference.
Sucking on the straw reduces the air pressure inside it. This allows 'natural' air pressure to push down on the liquid in the container, causing it to rise up the straw..
When you suck on a drinking straw, you decrease the air pressure inside the straw. This creates a pressure difference between the inside and outside of the straw, causing the liquid to be pushed up into the straw and towards your mouth due to atmospheric pressure.
when you drink through a straw you remove some of the air in the straw. Because there is less air pressure of the straw is reduced. But the atmospheric pressure on the surface of the liquid.
"Muscular action reduces air pressure in the mouth, whereupon atmospheric pressure forces the drink up the straw." ~ Wikipedia
It is simply creating a low pressure
When you suck on a drinking straw, you are creating a lower air pressure inside the straw compared to the outside air pressure. This pressure difference causes the liquid to be pushed up the straw and into your mouth. So sucking on the straw essentially helps to control the flow of liquid into your mouth.
when you drink through a straw you remove some of the air in the straw. because there is less air the pressure of the straw is reduced. but the atmospheric pressure on the surface of the liquid remains the same. henceforth how it helps you drink
As you suck on the straw air is removed from the inside of the straw and the air pressure within the straw is reduced. Once the straw's air pressure is reduced past atmospheric pressure of about 760 mmHg, the Patm forces the drink up the straw and into the sucker's mouth. Gases move from high to low pressure areas until equilibrium is reached.
Drinking from a straw is the same as an egg going into a glass bottle, because air pressure in both cases is used to move something. In the straw, you reduce the air pressure in the straw, so the air pressure around the drink pushes it up into the straw and into your mouth. In the egg, you reduce the air pressure in the bottle, and air pressure around the egg pushes it down into the bottle.
When you press the top of the straw with your thumb, you create a seal which prevents air from entering the straw. The pressure inside the straw increases, causing the water to remain inside the straw due to the force of gravity and the seal created by your thumb.