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You are here: Home / Class 8 / Force and pressure / Applications of atmospheric pressure

Applications of atmospheric pressure

Last Updated on March 20, 2019 By Mrs Shilpi Nagpal 17 Comments

Question 1What type of pressure is involved in the filling of a liquid in a syringe?

Question 2 What is a rubber sucker?

Question 3 How does a rubber sucker works?

Question 4 State few uses of rubber sucker?

Question 5 How does a syringe work?

Question 6 What is a syringe?

Question 7 How does a dropper work?

Question 8 What is a dropper?

1)Drinking straw

The drinking straw is a very thin pipe which is used to drink Soft drinks.The drinking straw works on the existence of atmospheric pressure. The lower end of drinking straw is dipped in the soft drink. When we suck at the upper end of the straw with our mouth, the pressure of air inside the straw and in our inner mouth is reduced. But the pressure acting on the surface of soft drink is equal to the atmospheric pressure.Greater atmospheric pressure acting on the surface of the soft drink pushes the soft drink up the straw into our mouth.

2)Syringe

A glass tube with a nozzle and Piston for sucking in and ejecting liquid in a thin stream is called syringe. The syringe works on the existence of atmospheric pressure. When the nozzle of a syringe is dipped in a liquid and its piston is withdrawn, the pressure inside the syringe is lower. The greater atmospheric pressure acting on the surface of the liquid pushes the liquid up into the syringe.

3)Dropper

The dropper is a short glass tube with a rubber bulb at one end and a nozzle at the other end.When we press the rubber bulb of the dropper by keeping its nozzle dipped in the liquid , air present in the glass tube and bulb is seen to escape in the form of bubbles. Due to this ,air pressure inside the glass tube and rubber bulb of dropper is very much reduced. When we now release the rubber bulb of dropper ,the much greater atmospheric pressure acting on the surface ,pushes the liquid up into the dropper tube.The rise of liquid in a dropper is due to  atmospheric pressure .If we remove the filled dropper from the container of liquid and press its rubber bulb slowly then the drops of liquid will come out of the nozzle of dropper tube.

4)Rubber sucker

A rubber sucker is a device made of rubber that sticks firmly to flat and smooth surfaces on pressing. A rubber sucker looks like a small, concave – shaped rubber cup.A rubber sucker is also called a suction Cup because it sticks to a surface by suction.When we press the rubber sucker on a flat ,smooth, surface , its concave rubber cup gets flattened to a large extent, pushing out most of the air from beneath it. Since very little air remains inside the flattened rubber sucker ,therefore the air pressure inside the rubber sucker becomes very low. The much greater atmospheric pressure acting on the rubber sucker from outside fixes the rubber sucker firmly to a flat surface due to the atmospheric pressure.

1)Rubber suckers are usually used to hold objects together with the help of suction.

2)They are used to hold glass table tops on to the wooden frames of table.

3)They are used for making suction hooks fixed on walls ,doors and almirahs.

A suction hook is a rubber sucker having a plastic hook attached to it.

Filed Under: Class 8, Force and pressure Tagged With: dropper, rubber sucker, straw, syringe, uses of rubber sucker

About Mrs Shilpi Nagpal

Author of this website, Mrs Shilpi Nagpal is MSc (Hons, Chemistry) and BSc (Hons, Chemistry) from Delhi University, B.Ed (I. P. University) and has many years of experience in teaching. She has started this educational website with the mindset of spreading Free Education to everyone.

Reader Interactions

Comments

  1. Kabir says

    April 30, 2018 at 1:01 pm

    very good

    Reply
  2. Varsha says

    June 10, 2018 at 10:40 am

    Most helpful

    Reply
  3. Rani says

    June 16, 2018 at 8:58 pm

    Comment
    Good

    Reply
  4. Rani says

    June 16, 2018 at 8:59 pm

    Comment
    Good wonderful

    Reply
  5. Shailja more says

    June 27, 2018 at 9:54 pm

    Beautifully presented good explanation

    Reply
    • Mrs Shilpi Nagpal says

      June 27, 2018 at 10:25 pm

      Thank u so much for your appreciation.

      Reply
  6. Kim soo min says

    August 25, 2018 at 6:07 am

    Thanks. It helped me in my physics project.

    Reply
  7. Kaahvi says

    September 2, 2018 at 5:43 pm

    Very helpful

    Reply
  8. Rama says

    September 25, 2018 at 9:24 pm

    Nice and useful to do my exams and homework well

    Reply
  9. ashish says

    October 14, 2018 at 8:22 am

    very nice and it is very useful and helpful to me thank thank ke thankyou

    Reply
  10. Krishana&sangam says

    May 25, 2019 at 8:18 am

    Thanks for help

    Reply
  11. Anjali says

    June 7, 2019 at 11:05 am

    It is good

    Reply
  12. Thanmayi says

    October 12, 2019 at 12:57 pm

    So good explanations. It helped me in my physics project.

    Reply
  13. G Hari babu says

    June 3, 2020 at 10:46 am

    it is very helpful for me because i am studying 8th class

    Reply
  14. SHIBAM SEN says

    June 25, 2020 at 5:47 pm

    IT HAS BEEN ELABORATELY DESCRIBED.NICE TO READ AND IT HAS HELPED ME IN DOING MY PROJECT
    .

    Reply
  15. supeetski says

    July 21, 2020 at 7:13 pm

    really nice

    Reply
  16. Avika says

    August 22, 2020 at 9:15 am

    You are a gift to everyone around you…………………..
    thank you it was useful answer……

    Reply

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