What is common in the working of the devices such as a drinking straw, a syringe, a dropper, and a rubber sucker?
What is common in the working of the devices such as a drinking straw, a syringe, a dropper, and a rubber sucker?
- All the devices such as a drinking straw, a syringe, a dropper, and a rubber sucker work on the principle of atmospheric pressure.
- There is a pressure difference created and fluids always flow from the region of high pressure to low pressure.
- The working of the devices are described as below:
(a) Straw-
(i) When we suck the air out of the straw, it creates low pressure in the straw.
(ii) Since the atmospheric pressure outside the straw is higher. So, liquid flows from outside into the straw.
(b) Syringe-
(i) It consists of a glass tube and a piston.
(ii) When the nozzle of the syringe is put into the liquid and the piston is withdrawn, then the pressure in the syringe is reduced.
(iii) The atmospheric pressure is higher as compared to the pressure in the tube. Hence, liquid flow from outside into the glass tube.
(c) Dropper-
(i) When we press the rubber bulb of the dropper by keeping its nozzle dripped in the liquid, the air present in the rubber sucker comes out.
(ii Due to this, air pressure in the dropper has been reduced.
(iii) When we release the rubber bulb of the dropper, greater atmospheric pressure outside, forces the liquid to move upward in the dropper.
(d) Rubber sucker-
(i) Very little air remains inside the flattened rubber sucker, therefore air pressure inside the rubber sucker is low.
(ii) Air pressure outside the rubber sucker is high.
(iii) Due to the difference in air pressure, the rubber sucker stays firmly on a flat surface.
- All the devices such as a drinking straw, a syringe, a dropper, and a rubber sucker work on the principle of atmospheric pressure.
- There is a pressure difference created and fluids always flow from the region of high pressure to low pressure.
- The working of the devices are described as below:
(a) Straw-
(i) When we suck the air out of the straw, it creates low pressure in the straw.
(ii) Since the atmospheric pressure outside the straw is higher. So, liquid flows from outside into the straw.
(b) Syringe-
(i) It consists of a glass tube and a piston.
(ii) When the nozzle of the syringe is put into the liquid and the piston is withdrawn, then the pressure in the syringe is reduced.
(iii) The atmospheric pressure is higher as compared to the pressure in the tube. Hence, liquid flow from outside into the glass tube.
(c) Dropper-
(i) When we press the rubber bulb of the dropper by keeping its nozzle dripped in the liquid, the air present in the rubber sucker comes out.
(ii Due to this, air pressure in the dropper has been reduced.
(iii) When we release the rubber bulb of the dropper, greater atmospheric pressure outside, forces the liquid to move upward in the dropper.
(d) Rubber sucker-
(i) Very little air remains inside the flattened rubber sucker, therefore air pressure inside the rubber sucker is low.
(ii) Air pressure outside the rubber sucker is high.
(iii) Due to the difference in air pressure, the rubber sucker stays firmly on a flat surface.
