0
The simple answer is that when you sip on a straw you draw air out of it. Since there cannot be a vacuum, the liquid comes up the straw to replace the air.
But this is also happening: When you sip on a straw you cause a reduction in air pressure inside the straw. The air pressure on the liquid outside the straw is now greater than on the inside. Because nature doesn't like an imbalance, it gets pushed down into the glass and thus up the straw.
Wiki User
∙ 16y ago
Wiki User
∙ 14y agoWhen you suck on a straw, you create a region of lower pressure in the top of the straw as compared to the pressure in the atmosphere. So the atmospheric pressure, since it's of a higher pressure than the top of the straw, pushes the liquid in the container up the straw.
Wiki User
∙ 12y agoYou draw water up a straw when you suck the water (or air) out that is already inside the straw, creating a vacuum.
But more precisely, it is the pressure of the outside air that pushes the water up the straw. When you expand the space inside your mouth, you reduce the pressure at the open end (top) of the straw. The air outside is pushing down on the surface of the water in the glass, and when this is greater than the pressure at the top of the straw, the air pushes liquid into the straw, up the straw, and into your mouth. If you relax your mouth, the water will flow back down the straw into the glass, drawn by gravity.
To test this, you can place a tight layer of plastic wrap on top of your glass, and when you suck on the straw, the plastic will be pushed down into the glass.
Also, you can use a glass tube through a tight stopper, on a beaker mostly filled with water. As you draw some water out, the air above the water reduces in pressure, and at some point it may become impossible to draw more water out unless more air is allowed to enter the beaker.
Wiki User
∙ 10y agoThis is capillary action. This is one of the processes by which the fluids in a tree reach the branches.
Osmosis at the roots allows mineral solution to enter the plant tissue.
Then capillary action aids its travel to the tips of the tree.
And at the leaf surface, the surplus water is transpired by the leaf through the stomata. Thus creating a (minute) pressure difference, allowing more fluid to climb.
Wiki User
∙ 11y agoIt's not actually pushed up. When you suck on the straw you create a vacuum and the liquid rises to fill the vacuum.
Wiki User
∙ 11y agoYou just simply suck it up through the straw.
Add your answer:
Earn +20 pts
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 a liquid travels up a straw when you suck on it?
1) Air inside the straw moves 2)Pressure inside decreases 3)Pressure of the atmosphere is greater then the Pressure inside the straw=Liquid moves up the straw!!!
Is it true that liquids rise in a straw because of suction?
yes <><><><><> Actually, the pressure outside the straw presses the fluid up into the straw.
Why does a straw hold water if you put your thumb over top of it?
When a thumb is placed over the hole in the top of the straw, it seals the entry way for air. When the straw is pulled out of the water, it is to be noted that a drop or two of water falls out of the bottom but no more falls. This is because when the water droplets fall, this creates more space in the air pocket in the top part of the straw. WIth more space the pressure decrease in the air pocket. In addition, gravity is working on the water inside the straw, but these two forces do not outweigh the force of atmospheric pressure outside, as a result, the water stays within the staw.
Why does the straw in the water look broken?
Due to the phenomenon of refraction being caused; straw appears to be bent in water.
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.
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.
How does milk rise up when you drink milk from a bottle with a straw?
When you suck from a straw you create a partial vaccuum which reduces the air pressue inside the straw. The air pressure outside the straw pushes down on the milk and forces it up through the straw.
What happens when you drink through a straw?
This question points up some key misconceptions about what a vacuum is.So you put a straw in your cup of water. If you look down the straw or could look through it, you would see that the level of water inside and outside the straw are exactly the same. This is because the atmosphere is pushing down on the water inside the straw, and it is pushing down equally hard on the water outside the straw. So the pressures are equal.When you suck on the straw, you are decreasing the pressure in your mouth and lowering the pressure of the air in the top of the straw. When that happens, the force of the atmosphere pushing on the water in the glass is higher than the force of gas inside the straw. The atmosphere forces the liquid up the straw into your mouth. So, in essence, you ARE NOT sucking the liquid into your mouth, the atmosphere is pushing it there.This is easily proved by an experiment. Try drinking water from a straw that is more than 20 meters tall. It won't work. At around 20 meters, the massive column of water inside the straw would be pulled down by gravity, with a force greater than the upward force caused by the atmosphere. Even if you completely evacuate the straw with a high-powered pump the water won't make it up the straw. This is why you can't pump water out of a well that is more than 20 meters deep in the ground. Anything deeper than that and you need to use a compressor to pump air at high pressure down into the well, to force the water out (essentially make the upward pressure higher than the atmosphere alone provides), or revert to the tried and true method using buckets.Of course, a similar principle applies with underground or artesian wells. The water there is already under greater pressure and will flow to the surface if given a path.
Do straw float in a glass of water?
Yes, plastic drinking straws will float in water.
What is demonstrated by water moving a straw?
The power of suction. If you suck through a straw, the air within as nowhere to go as does the water inside it other than your mouth. Straws allow you to suck in any liquid you stick them into. That is, as long as the straw does not have a hole in it.
How does drinking through a straw show that fluids flow from areas of high pressure to areas of low pressure?
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..
Why doesn't water in an eyedropper move?
vacuum is what holds the water in place. it`s the same thing as when you put a straw into a glass of water, hold your finger tight over the end of the straw and then lift the straw out of the water, holding the water inside the straw until you remove your finger from the end. in the case of the eye dropper, the water is forced out when the bulb is squeezed. vacuum is the force at work in both instances holding the water.
Why a liquid travels up a straw when you suck on it?
1) Air inside the straw moves 2)Pressure inside decreases 3)Pressure of the atmosphere is greater then the Pressure inside the straw=Liquid moves up the straw!!!
Is it true that liquids rise in a straw because of suction?
yes <><><><><> Actually, the pressure outside the straw presses the fluid up into the straw.
The water in a drinking straw does not drip out when you press te top of the straw with your thumb or finger tip?
It's a matter of air pressure that acts on the water. When the straw is uncovered, there are two forces acting on the water inside. There is gravity, pulling the water down, and air pressure. The pressure is about the same on both ends of the straw, but on the top of the straw, the pressure pushes the water downward, and on the bottom of the straw, the pressure pushes upward. Both of the pressures are the same, so the net force is just the force of gravity pulling the water down and out of the straw. When you cover the top of the straw, you block the air from pushing down on the water. In this case, the only forces on the water are the air pressure pushing up, and gravity pulling down. However, the air pressure is a greater force than gravity, and keeps the water in the straw despite gravity's pull.
What does color pale straw in urine indicate in Urinalysis?
low quantity of water in the body --------------------------------------------------------------------------------->> Actually, straw and pale straw are the colors of normal urine. So if the urine color is different from these-- then there must be something wrong inside your body.
