Advertisements
Advertisements
प्रश्न
What is the purpose of a barometer? State two major defects of a simple barometer.
Advertisements
उत्तर
Simple barometer has two main defects:
(i) It is not suitable for making an accurate measurements of atmospheric pressure as any change in the level of mercury in the tube changes the level of the free surface of mercury is a trough and fixed scale cannot be used with it.
(ii) Simple barometer is not portable. So, it cannot be used by airmen, navigators, mountaineers, who need a portable barometer.
APPEARS IN
संबंधित प्रश्न
Fill the missing word in the blank spaces in the following statements:
Air moves from a region of __________ pressure to a region of ________ pressure.
Describe a simple experiment to illustrate that air exerts pressure.
Why does the liquid rise in a syringe when its piston is pulled up?
What is meant by the statement 'the atmospheric pressure at a place is 76 cm of Hg'? State its value in Pa.
State two factors which affect the atmospheric pressure as we go up.
What is an altimeter? State its principle. How is its scale calibrated?
What is meant by the term ‘Atmospheric Pressure’?
Give reason:
Air pressure decreases with increasing altitude.
At higher altitudes, air becomes ______
