when u suck from a straw (no offense lol) u r taking air from it and it is not replaced by any so pressure starts to decrease ..... when it gets stronger it pulls liquid(being heavier than air!)
but when cup is empty no pressure decrease as air is replaced by air.
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.
The pressure in the straw goes to negative.[We cannot have a negative pressure - this grammar form is known as an oxymoron.]A2. The pressure in the straw is reduced, and thus the liquid is able to be drawn higher in the straw.
You need to create a difference in air pressure between the inside and outside of the straw for air to come out. By sucking on the straw, you create low pressure inside, causing the atmosphere's higher pressure to push the air through the straw and into your mouth.
When you suck on a straw, you create a vacuum in your mouth, and the atmospheric pressure pushes the liquid up the straw and into your mouth. The difference in pressure between the area inside the straw and outside is what causes the liquid to move upwards.
When air is sucked out of a closed container, the air pressure inside the container decreases. This occurs because there are fewer air molecules colliding with the walls of the container, resulting in a lower pressure.
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.
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.
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.
The pressure in the straw goes to negative.[We cannot have a negative pressure - this grammar form is known as an oxymoron.]A2. The pressure in the straw is reduced, and thus the liquid is able to be drawn higher in the straw.
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
"Nature Abhors a vacuum," proclaimed Aristotle. And he was right, at least as far as sucking through straws is concerned. Air is a gas, a combination of carbon dioxide and oxygen, amongst other compounds. As a gas, its form is mutable and expands to fill the available space. It exists both outside and inside the straw. By sucking through the straw, one lowers the pressure within it so that the air pressure on the outside is greater than that on the inside. The outside pressure acts upon, say, the liquid in the cup, and it flows into the straw to replace the diminishing air pressure within. The act of drawing the air out of the straw causes the liquid to enter it. Thus, the liquid is sucked up the straw due to that initiating act (i.e. the liquid is pulled, not pushed, up the straw). Alas, the answer to your question is: no. It is not more accurate to say the liquid is pushed up the straw rather than sucked up, however, the accuracy of either statement itself leaves much to be desired.
You need to create a difference in air pressure between the inside and outside of the straw for air to come out. By sucking on the straw, you create low pressure inside, causing the atmosphere's higher pressure to push the air through the straw and into your mouth.
When you suck on a straw, you create a vacuum in your mouth, and the atmospheric pressure pushes the liquid up the straw and into your mouth. The difference in pressure between the area inside the straw and outside is what causes the liquid to move upwards.
When air is sucked out of a closed container, the air pressure inside the container decreases. This occurs because there are fewer air molecules colliding with the walls of the container, resulting in a lower pressure.
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.
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 suck on a straw, you decrease the air pressure inside the straw, creating a low-pressure area. The higher air pressure outside the straw pushes the liquid up the straw and into your mouth because fluids flow from areas of high pressure to areas of low pressure.