0
Why water does not spill out from a straw if you close its mouth with a finger?
Wiki User
∙ 13y ago
When you hold the mouth closed then it will spill out, but after you sucked it and put your finger in its mouth... that's a diffrent story. You see the finger traps the air for escaping, which makes the water more active, since its squished toghther.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
Why does the drinking straw does not drip out when you press the top of the straw with your thumb or finger tip?
Your finger prevents air from entering through the top of the straw. As fluid moves down the straw it leaves a void in it's wake, one that is usually immediately filled by air. By preventing the air from entering the top of the straw, the fluid cannot move downwards because to do so would leave a vacuum space between your finger and the fluid; this "sucks" the fluid back in into place and prevents it from decending down the straw.
Why do the water in a drinking straw does not drip out when you press the top of the straw with your thumb or finger tip?
Because under your thumb, inside the straw, there is now a vacuum which keeps the water in.
When you suck from a straw you make your mouth bigger so what happens to the air pressure in your mouth?
It increases.....
How does the last amount of liquid in a straw get into your mouth when the cup is empty and there is no more surface liquid for atmospheric pressure to work on forcing the liquid up the straw?
Air pressure within the straw.
How can you make fluid flow up a straw?
you use the suction force from your mouth and it flows upward
The water in a drinking straw does not drip out when you press the top of the straw with your thumb or finger tip?
there is no air
Why does the drinking straw does not drip out when you press the top of the straw with your thumb or finger tip?
Your finger prevents air from entering through the top of the straw. As fluid moves down the straw it leaves a void in it's wake, one that is usually immediately filled by air. By preventing the air from entering the top of the straw, the fluid cannot move downwards because to do so would leave a vacuum space between your finger and the fluid; this "sucks" the fluid back in into place and prevents it from decending down the straw.
Why do the water in a drinking straw does not drip out when you press the top of the straw with your thumb or finger tip?
Because under your thumb, inside the straw, there is now a vacuum which keeps the water in.
Why the water in a drinking straw does not drip out when you press the top of the straw with your thumb of finger tip?
Because under your thumb, inside the straw, there is now a vacuum which keeps the water in.
What make milkshake go up your straw?
When you suck on the straw, the pressure inside your mouth is less than the outside air pressure. Because of the imbalance, the outside pressure pushes the milkshake down the glass, up the straw and into your mouth.
When you suck from a straw you make your mouth bigger so what happens to the air pressure in your mouth?
It increases.....
What is butterfly mouth call?
Proboscis ... it is like a drinking straw.
What does drink your bathwater with a straw mean?
no, you just slurp with your mouth
What did Rumpelstiltskin prick his finger on?
In the story of Rumpelstiltskin, he pricked his finger on a spinning wheel while trying to turn straw into gold for the miller's daughter.
How does the last amount of liquid in a straw get into your mouth when the cup is empty and there is no more surface liquid for atmospheric pressure to work on forcing the liquid up the straw?
Air pressure within the straw.
How does straw function while drink?
When you 'suck' on a straw, you reduce the air pressure inside it. This means the air pressure on the surface of the liquid outside the straw is greater - so it pushes down, which forces liquid up the straw into your mouth.
How do differences in air pressure cause a liquid to flow through the straw and into your mouth?
The pressure inside your mouth is less than the atmosperehic pressure above the glass. The water is pushed through the straw by this difference in pressure.
