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If you hold your finger over the top of the straw it does not because the gravitational force pulling on the water towards the opening at the bottom is not great enough to overcome the vacume created on the top by your finger over the hole. Space is occupied by matter and therefore displacement of matter must be replaced by matter itself whether it be air or some other substance.
What else can I help you with?
Which are demonstrated by water moving up a straw?
The power of suction is what is demonstrated by water moving up a straw. When you suck through a straw, the water has nowhere to go but up.
Do straw float in a glass of water?
Yes, plastic drinking straws will float in water.
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.
Why does a straw appear bent in a cup of water?
A straw looks "bent" when it's in water because water causes light to "change course" when it moves from air into the water. The light will again be caused to change course when it leaves the water to go back into air. This is called refraction. Refraction is a fundamental property exhibited by a wave that changes mediums through which it is traveling.Or, making it simple..A straw seems bent because water is denser than air, so when it changes from air to water is applied it seems bent.
What force is drinking out of straw?
It is all to do with air pressure. We lower the air pressure inside the straw by sucking the air out of it, atmospheric pressure which is pushing down on the surface of the drink literally forces it up the straw into our mouth.
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 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 the water in a drinking straw does not drip out when you press the top of the straw with your thumb?
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.
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.
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?
When you press the top of the straw with your thumb or finger tip, the pressure you apply traps air inside the straw, preventing the water from dripping out. The pressure you exert keeps the water forced inside the straw despite gravity trying to pull it down.
Unblock your nose after using cocaine?
Take a skinny straw and get a couple of drops of water in it. Snort it. The drip is disgusting, but it does the trick.
Why would the water in your drinking straw not drip out when you press the top of the straw?
When you press the top of the straw, you create an area of low pressure inside the straw. The atmospheric pressure outside the straw then pushes the water up into the straw, preventing it from spilling out. This balance of pressures keeps the water inside the straw when you press the top.
What happens to the water in the straw when you take your finger off the top?
When you take your finger off the top of a straw, the atmospheric pressure pushes the water up the straw to fill the empty space created by your finger. This is due to the difference in pressure between the top and bottom of the straw.
What is water flowing drip by drip?
Water from my central air conditioning drip pan caused a leak in my celling it was full of water when i shut it down it started to drip
What happens to the straw placed in plastic cup full of water?
straw seems at above from the bottom and seems to be broken because water bent the rays of light as the light leaves the water it is bent or refracted from its usual straight line.
How do you say 'drip' in Japanese?
(water is dripping) drip "teki" (saline drip) drip tenteki
When your 1997 skylark is running there is a steady stream of coolant coming out the bottom but when its off its just a drip any suggestions?
Water Pump
