Role of atmospheric pressure in filling of syringe
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The role of atmospheric pressure in filling of a syringe is very important.
When the piston of the syringe is pushed, the sit gushes in and while we dip the same into the liquid, the pressure increases thereby filling the same.
The pressure inside decreases and due to that the liquid medicine rushes into the syringe.
When the piston of the syringe is pushed, the sit gushes in and while we dip the same into the liquid, the pressure increases thereby filling the same.
The pressure inside decreases and due to that the liquid medicine rushes into the syringe.
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Explanation: When the piston is pulled up, the air (atmospheric pressure) inside the syringe reduces (as air is pulled out), so the air pressure inside the syringe becomes low and outside, air pressure is comparatively high. As air moves from high to low pressure regions (area), the air outside pushes on the liquid (in the container or from where you filling the medecine in the syringe) and the liquid enters the syringe.
This is simlar to the working of a straw when we suck it to drink water (or any liquid).
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