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How is the barometric height of a simple...

How is the barometric height of a simple barometer affected if
(a) its tube is pushed down into the trough of mercury ?
(b) its tube is slightly tilted from vertical ?
(c ) a drop of liquid is inserted inside the tube ?

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The correct Answer is:
(a) remains unaffected
(b) remains unaffected
(c ) decreases
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How is the barometric height of a simple barometer affected if Its tube is pushed down into the trough of mercury?

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A liquid can rise to a height of h in a capillary tube of length l ( l gth ) . The tube filled with the liquid is kept horizontal with its two ends open. Now the tube is kept vertical with the liquid in it. Some liquid flows out. Find the height of the liquid remaining in the tube if the surface tension of the liquid is sigma .

Torricelli was the first do devise an experiment for measuring atmospheric pressure . He took calibrated hard glass tube , 1 m in lengt and of uniform cross section , closed at one end . He filled the whole tube with dry mercury taking care than no air or water droplets remain inside the tube , closed the opposite end of the tube tightly with thumb and inverted it . He put this inverted mercury tube into a mercury through , taking care that the end of the tube remains inside the mercury through , An interesting thing was noticed . Mercury in the tube fell down at first and then stopped at a particular position . The height was 76 cm above the free surface of mercury in the through . When the given tube was inclined or lowered in the mercury trough , the vertical haight of mercury level in the tube was always found constant . Torricelli explained this by saying that the free surface of mrcury in the trough . Hence , the hydrostatic pressure exerted by the trough measures the atmospheric pressure . If a small hole is made at point P in the barometer tube , then

ICSE-PRESSURE IN FLUIDS AND ATMOSPHERIC PRESSURE-Exercise -4(B)
  1. What is a barometer ? How is a simple barometer constructed ?

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  2. Explain how is the height of mercury column in the tube of a simple ba...

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  3. Illustrate with the help of a lebelled diagram of a simple barometer ...

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  4. Why is the barometric height used as a unit to express the atmosphric ...

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  5. What is meant by the statement “the atmospheric pressure at a place is...

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  6. How will you show that there is vacuum above the surface of mercury i...

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  7. How is the barometric height of a simple barometer affected if (a) i...

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  8. State two uses of a barometer.

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  9. State two advantages of use of mercury as a barometric liquid.

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  10. Water is not used as a barometeric liquid because :

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  11. Mention two demerits of a simple barometer and state how they are remo...

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  12. Draw a simple labelled diagram of a Fortin barometer and state how it ...

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  13. State two advantages of an aneroid barometer over a simple barometer.

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  14. How is the reading of a barometer affected when it is taken to (i) a ...

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  15. How does atmospheric pressure change with altitude ? Draw an approxima...

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  16. State two factors which affect the atmospheric pressure as we go up.

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  17. Why do ink pens start leaking at high altitudes?

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  18. Why does nose start bleeding on high mountains?

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  19. What is an altimeter ? State its principle. How is its scale calibrate...

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  20. What do the following indicate in a barometer regarding weather : (a...

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