when we use a drinking straw,what unblanaced force pushes the liquid up the straw? explain briefly with the help of the diagram.if there is a small hole in the upper part of the straw what difference does it make,if any? if you answer then only answer
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When you suck on the straw, you increase the volume of the air already inside it thereby reducing the pressure of the air column. This means pressure on water decreases inside straw but remains same over exposed surface. This difference in pressure is what forces liquid up the straw. Surface tension also plays a role but only in very thin straws.
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When a drink is sucked with help of a straw the air inside the straw goes into our lungs and thus air pressure in the straw decreases .The atmospheric pressure acting on the free surface of the liquid pushes the liquid into the straw and then into our mouth .
In the straw with a hole at it's upper part , partial vacuum cannot be created by sucking as the inside of the straw is always connected with the outside atmosphere .This allows air to enter, preventing the straw from working properly.
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