How does a drinking straw works on atmospheric pressure?
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Air pressure is the pressure created by air in any container or open space and the atmospheric pressure is the pressure created by air present in atmosphere in the atmosphere.
Air pressure is the weight of airpressing down on earth and all other objects present on it. ... Now due to absence of air, the air pressure in the straw decreases. Hence, the air pressure present on the liquid of the glass pushes the liquid into the straw causing it to move upwards and thus, helping us drink.