Rohit while drinking liquid with a straw started playing with it and kept his thumb on the top of the straw with the liquid in it. He was surprised to see that liquid was not falling down the tube. What is the reason behind this observation?
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Answer:
That makes atmospheric pressure higher than the pressure in the straw which force the liquid to go up into the straw and into your mouth. So, atmospheric pressure plays important role while drinking a liquid with a straw.