Measurement of Atmospheric Pressure
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Questions and Answers

What happens to atmospheric pressure as altitude increases?

  • It increases
  • It fluctuates
  • It remains constant
  • It decreases (correct)
  • Why is mercury preferred as a barometric liquid in barometers?

  • It is a dull liquid
  • It wets glass easily
  • It has a high density (correct)
  • It has a low density
  • What property of mercury makes it easily visible in a barometer?

  • It wets glass easily
  • It is a shiny liquid (correct)
  • It is a dull liquid
  • It is not shiny
  • Who was the Italian scientist credited with first measuring atmospheric pressure using a barometer?

    <p>Evangelista Torricelli</p> Signup and view all the answers

    Why does the mercury level in a barometer decrease when taken up a mountain?

    <p>The air pressure is lesser</p> Signup and view all the answers

    What characteristic of mercury prevents it from wetting glass in a barometer?

    <p>High density</p> Signup and view all the answers

    What is the purpose of an 'aneroid barometer'?

    <p>To measure atmospheric pressure without using barometric liquid</p> Signup and view all the answers

    How does an aneroid barometer work?

    <p>By balancing the internal fluid pressure with the external atmospheric pressure</p> Signup and view all the answers

    What is the role of the lift pump mentioned in the text?

    <p>To lift water to a certain height without the use of electricity</p> Signup and view all the answers

    How does atmospheric pressure help in drinking through a straw?

    <p>By creating low pressure inside the straw to suck up the liquid</p> Signup and view all the answers

    What happens when air is expelled out of a tin can due to heating according to the text?

    <p>The can crushes under high atmospheric pressure</p> Signup and view all the answers

    What purpose does a syringe or perfume spray serve according to the text?

    <p>To create low pressure for sucking up liquids</p> Signup and view all the answers

    What happens to the water level in the cylinder when valve v1 is closed?

    <p>The water level stays the same</p> Signup and view all the answers

    Why does water rush above the piston when the pressure in the cylinder increases?

    <p>Due to the weight of the water column in the tube</p> Signup and view all the answers

    What is a limitation of using a mercury barometer?

    <p>It can easily get contaminated</p> Signup and view all the answers

    Why would it be impractical to use water as a barometric liquid?

    <p>Because it requires a very large height of water</p> Signup and view all the answers

    What happens when the pressure inside the cylinder decreases during the piston's upward movement?

    <p>Valve v1 opens</p> Signup and view all the answers

    How does water rise from the well into the cylinder?

    <p>By opening valve v2 and closing valve v1</p> Signup and view all the answers

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