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Why does when you cover up 1 end of a straw the water stays on the end?
Wiki User
∙ 13y ago
surface tension?
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∙ 14y ago
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Why does Soda straw doesn't draw liquid if there is a tiny hole at its upper end?
That's because you suck in air instead. From an energy standpoint, energy gets wasted by the incoming air. But if the holes are rather small, and you suck strongly, you might still manage to suck in some liquid. Actually this is rather easy to explain, when you suck at a straw, you create a vacuum in your mouth. This makes the nearest molecules flow there. Like high and low pressure zones that create wind flows. But then with water via a straw. When there are holes in your straw, the first thing that is getting sucked in, is the air around you and the straw. Basically, you are wasting energy. The best thing to do is just get a new straw and enjoy your drink!
Hairlike cilia cover tiny knobs at end of neurons?
yes
How do you level ground?
Make up a water level, this consists of a clear plastic tube full of water with one end in a bucket of water Make sure the tube is long enough to cover the whole area of the proposed pool. you will note that the water level in the tube is always the same as that in the bucket and this will give you the reference you need to measure the slope in the land .
What is the area of Water End Swallow Holes?
The area of Water End Swallow Holes is 113,000.0 square meters.
What cycle has water as an end product?
the water cycle The water cycle. (It ends as rain - which is water.)
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 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 water converts into ice in seconds using salt and fired straw?
Plain water freezes at 32 degrees F and salt water freezes at 35.42 degrees F so salt water will freeze faster. In the experiment a drinking straw is inserted into the water after one end of the straw is burned (fired) to seal it off. The straw acts as a hydrometer, which measures the density of water. It is said that after the straw is removed ice crystals form. This has been found not to be true.
Why is it very difficult to spear a fish unless you are under water?
Because when light passes from water into are - it refracts or bends. This makes the fish appear to be in a different place to where it actually is. You can demonstrate the effect using a glass of water and a drinking straw. Half-fill a glass with water, then lower one end of a straw into it. You will see the straw 'bends' as it hits the water. It's the same effect in spearing fish.
What do you call the end of a straw wrapper that a waiter leaves on your straw when serving your drink?
strawlace
Does a solar cover have to actually touch the water?
Yes, the solar cover should touch the pool water. The cover absorbs the heat from the sun and then transfers that heat to the water. If the cover does not touch the water, most of the heat will end up in the air between the cover and the water rather than going into the water itself. Hope this helps ...
What is the length of 1 million straws from end to end?
It depends on the length of the straw. I would go get a straw, measure it with a ruler, and multiply that by 1,000,000. So if the straw was 4 inches, it would be 4,000,000. You could also google .... length average "drinking straw".... without the quotes.
What is the end of Diary of a Wimpy Kid last straw?
Uh, The End whats your problem?
How does water rise inside a straw?
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.
What does pull a vacuume mean?
pulling out as much of the particals in a given space, as possible. when you put a finger on one end of a straw and suck on the other end the straw collapses; you are pulling a vacuum.
What is the buoyancy principles?
The buoyancy principle states that when an object is submerged in a liquid, the object experiences an upward buoyancy force that is equal to the weight of the liquid the object displaced.For a non-mathematical explanation of the principle go to the question "Why do some things float but not others" which is in the Related Questions section below.In fact I suggest that you read that question before reading this one because this question is in some respects an extension of that one.First imagine some arbitrarily shaped shell filled with water. Imagine the shell is weightless and very rigid. If we were to attach a string to it and weight it we would find it would take a certain force to hold it up, however if we were to then lower the shell of water into a basin of water the shell would neither sink to the bottom nor float to the top, it would just float around under the surface of the water held up by the buoyancy force. This is because the buoyancy force, which is up, would be exactly equal the downward gravitational force we just measured.Now imagine if the shell surrounding the water just magically disappeared. Absolutely nothing would happen. And if a similar rigid shell just magically surrounded some other volume of the water, again nothing would happen. This is because a "pressure gradient" has developed in the water which is specifically "designed" to hold up any portion of water whether or not that portion of water is surrounded by a massless rigid shell or not.To appreciate the nature of this pressure gradient imagine sticking a stiff drinking straw vertically down into the water. When you think about it, the only thing holding up the water in the straw is the water at the very bottom end of the straw. It is under pressure and pushing up against the water above it.Imagine the straw has a cross sectional area A. Pressure is a measure of force per unit area, so the force with which the water at the bottom of the straw is pushing up is the pressure at that depth times the area, or...Force = Pressure x Area ( F = P·A)The mass of the water in the straw is the density of the water times the volume in the straw or..mass = density x (Volume) = density x (Area x Depth)or using symbolsm = ρ·V = ρ·(A·D)We can see that the mass of the water in the straw depends directly on how deep the straw is. This also means that the force necessary to hold up the water in the straw directly depends on how deep the straw is. Since the area at the end of the straw is constant, the only way the upward force is going to increase with depth is if the pressure at the end of the straw increases with depth.So again, as we lower the straw we can see how the pressure of the water needs to increase with depth if it is going to hold up the water in the straw above it.Just as with the rigid shell, it doesn't matter whether the straw is there or not, the pressure, must increase in proportion to the depth. Think of the pressure of the water at a given depth as the amount that the water is being squeezed.It is in fact easy to calculate what the pressure must be at a given depth.If the mass of the water in the straw is..m = ρ·A·DThen the force isF= (m)·g = (ρ·A·D)·gwhere g is the acceleration of gravity.Since the pressure is the force per unit area, dividing both sides by the area we get...Pressure = F/A= ρ·g·DThis equation describes the pressure gradient or the way the pressure increases with depth.To understand how this pressure gradient creates the buoyancy force, we will first think about the simplest case. Imagine if the straw we discussed above where completely submerged. We will only be thinking about the forces acting on the water in the straw. The water under pressure at the bottom of the straw is pushing up with a force that is large enough to hold up a straw of water that reaches to the surface. However the water in the straw does not reach the surface. Instead the water under pressure at the top of the straw is pushing down on the water in the straw. The upward force at the bottom is larger than the downward force at the top and the difference is exactly what is required to hold up the water in the straw. To understand why, imagine an extension to the straw that causes it to reach the surface. The force at the bottom of the extension is large enough to hold up the water in the extension. The upward force acting on the bottom of the extension is equal to the downward force acting on the top of the submerged straw. The magnitude of this downward force is exactly equal to the amount the upward force, at the bottom of the straw, is to large. Now replace the straw with an un-sharped wooden pencil. Because the wooden pencil is less dense than water the pencil will weigh less. The buoyancy forces that were acting on the water in the straw are now acting on the pencil and since the pencil weighs less it will rise to the surface.Now imagine, submerged in water, an arbitrarily shaped shell filled with water. The buoyancy force acting on the shell is what is keeping it suspended. If you imagine the shell shape to be composed of a very large number of straws pressed together, the reasoning used to understand why the water in a single straw is suspended can now be used to understand why the water in the shell shape is suspended. Once you understand why the water in the shell shape is suspended, you completely understand the buoyancy force.
What stays with Everyman till the end?
his will to survive
