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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.
Wiki User
∙ 10y ago
Wiki User
∙ 13y agoDifference in pressure.
Fluids, such as soft drinks, will always move from an area of higher pressure toward one of lower pressure, as long as the resultant force is enough to overcome gravity.
The difference in the force due to gravity between the bottom of your straw and the top (where your lips are) is incredibly small, and so can be neglected.
When a person sucks on a straw, he creates an area of low pressure at the top of the straw.
In physics, we learn that one of the ways Force can be described is pressure times area. But the area at the top of a straw is the same as at the bottom, the straw being a cylinder.
Let us start with F = P X A, or force equals pressure times area.
Now we have already established that the cross-sectional area at the top of a straw is the same as the bottom. So in this case, Area (A), becomes a constant. Let us call it 1 unit of area.
So the force is proportional to pressure times one.
And so, when the straw is sucked, creating a lower pressure at the top, area being equal, the force at the bottom of the straw becomes greater than the force at the top of the straw. The fluid has no choice but to move upward.
Wiki User
∙ 11y agoWhen sucking the straw, we force the state of vacuum and atmospheric force act on liquid surface pushing the liquid up the straw.
Wiki User
∙ 11y agoI think Pull
Wiki User
∙ 12y agoOne does not simply use The Force...
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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 a vacuum cleaner works rather like a drinking straw?
both suck things up
Do straw float in a glass of water?
Yes, plastic drinking straws will float in water.
What prevents mercury in the tube of a barometer from running out into the container at the bottom of the tube?
The top of a barometric tube is sealed leaving no place for air to escape. It works along the same principle as a drinking straw, but in reverse. In a drinking straw, the sucking motion reduces the pressure of the air inside the straw to a lower level than the air outside the straw. Liquid resists changes in volume due to pressure and is drawn up through the tube due to the air pressure exerted on the surface of the liquid outside the straw. In a barometric tube the tube is sealed at one end, trapping a finite amount of gas in the tube. The air pressure inside and outside the tube is equal, keeping the mercury suspended at a certain level. If the pressure outside is raised, more force is exerted on the surface of the mercury outside the tube than on the surface inside. This raises the level of the mercury in the tube until the pressure of the air is equalized -- there is still just as much air in the tube, but a smaller volume at a greater pressure.
What Chianti has straw around the bottle?
Chianti Classico Raffino had the straw around the flask
Did the Chinese invent the drinking straw?
The drinking straw as we know it today was invented in 1888 by Marvin Stone.
Can you eat a straw?
No, not a drinking straw. As for straw as in grass, I guess someone could eat that.
When was the drinking straw patented?
The modern drinking straw was patented on 3 December 1888 by Marvin Chester Stone.
Who was the drinking straw made by?
Historians have four that the earliest drinking straw was made by Sumerians for drinking beer. It was used to avoid the solid byproducts of fermentation.
Who created the drinking straw?
It is prehistoric.
What is drinking straw in Malay?
Penyedup
A drinking straw?
i like cheese
What is the shape of a drinking straw?
oval
What was the first drinking straw made of?
the chinese invented the straw made of bamboo
Who was the straw made by?
Historians have four that the earliest drinking straw was made by Sumerians for drinking beer. It was used to avoid the solid byproducts of fermentation.
Who created the idea of weaving straw and silk to make bonnets?
who created the drinking straw?
Does it take longer when drinking with a straw?
Its faster
