Pressure scale
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Questions and Answers

What is the unit of measurement for absolute pressure?

  • Pa (correct)
  • PSI
  • cm
  • kg/m
  • What is the force that attracts the air, resulting in atmospheric pressure?

  • Gravity (correct)
  • Magnetic force
  • Electromagnetic force
  • Frictional force
  • What is the 'standard' weight of the earth's atmosphere at sea-level?

  • 14.7 PSI (correct)
  • 16.7 PSI
  • 10.7 PSI
  • 17.7 PSI
  • What is the term for pressure measured relative to the atmospheric pressure at sea level?

    <p>Absolute pressure</p> Signup and view all the answers

    What is the term for pressure below the atmospheric pressure at sea level?

    <p>Vacuum pressure</p> Signup and view all the answers

    What is the term for pressure measured above or below the atmospheric pressure at sea level?

    <p>Gauge pressure</p> Signup and view all the answers

    What is the mixture of gases that has weight and exerts pressure?

    <p>Air</p> Signup and view all the answers

    What is the absolute pressure scale based on?

    <p>Absolute zero pressure</p> Signup and view all the answers

    What is gauge pressure measured using?

    <p>Atmospheric pressure as a starting point</p> Signup and view all the answers

    What is a vacuum?

    <p>A pressure lower than atmospheric pressure</p> Signup and view all the answers

    What is the purpose of the vacuum scale?

    <p>To measure pressures in pipes or vessels below atmospheric pressure</p> Signup and view all the answers

    What is the reading on the mercury vacuum gauge when the pressure is equal to atmospheric pressure?

    <p>Zero</p> Signup and view all the answers

    What would be the pressure in a closed chamber if we move all the air out of it?

    <p>Absolute zero pressure</p> Signup and view all the answers

    What happens when an unconnected pressure gauge with a vacuum scale is read?

    <p>It reads zero</p> Signup and view all the answers

    What is blood pressure?

    <p>The force exerted by the heart against the walls of the blood vessels</p> Signup and view all the answers

    Where is blood pressure usually measured in humans?

    <p>Over the brachial artery in the arm</p> Signup and view all the answers

    What is the systolic pressure?

    <p>The force that blood exerts on the artery walls as the heart contracts</p> Signup and view all the answers

    What is the normal range of systolic pressure in mmHg?

    <p>90-120 mmHg</p> Signup and view all the answers

    What is the diastolic pressure?

    <p>The lower level of pressure in arteries when the heart is at rest</p> Signup and view all the answers

    What is a healthy blood pressure reading?

    <p>110/70 mmHg</p> Signup and view all the answers

    What is surface tension pressure?

    <p>The pressure exerted by a liquid on its surface</p> Signup and view all the answers

    What is the primary reason for the existence of surface tension in a liquid?

    <p>Molecules at the surface do not have the same neighbors on all sides</p> Signup and view all the answers

    What determines the strength of surface tension in a liquid?

    <p>The type of molecular interactions present</p> Signup and view all the answers

    Why is the surface tension of water high?

    <p>Because water molecules interact with each other through strong hydrogen bonds</p> Signup and view all the answers

    What is the net force experienced by molecules at the surface of a liquid?

    <p>A net inward force towards the bulk</p> Signup and view all the answers

    In the bulk of a liquid, molecules are interacting with each other in which direction?

    <p>Equally in all directions</p> Signup and view all the answers

    What is the primary difference between molecules at the surface and in the bulk of a liquid?

    <p>Their number of neighbors</p> Signup and view all the answers

    What are the typical units of measurement for surface and interfacial tension?

    <p>N/m and dynes/cm</p> Signup and view all the answers

    Why do molecules at the surface of a liquid experience a net force towards the bulk?

    <p>Because they do not have the same neighbors on all sides</p> Signup and view all the answers

    What is the result of the net inward force experienced by molecules at the surface of a liquid?

    <p>An increase in surface tension</p> Signup and view all the answers

    Surface tension arises from adhesive forces between the liquid molecules and the surrounding air.

    <p>False</p> Signup and view all the answers

    At the surface of a liquid, molecules have the same neighbors on all sides.

    <p>False</p> Signup and view all the answers

    The surface tension of a liquid is dependent on the type of molecular interactions present.

    <p>True</p> Signup and view all the answers

    The units of surface tension are typically measured in meters per second (m/s).

    <p>False</p> Signup and view all the answers

    The net force experienced by molecules at the surface of a liquid is zero.

    <p>False</p> Signup and view all the answers

    Molecules in the bulk of a liquid interact equally with each other in all directions.

    <p>True</p> Signup and view all the answers

    The surface tension of water is low due to weak molecular interactions.

    <p>False</p> Signup and view all the answers

    Surface tension is a property of gases only.

    <p>False</p> Signup and view all the answers

    The strength of surface tension is the same for all liquids.

    <p>False</p> Signup and view all the answers

    Surface tension is responsible for the pressure exerted by a liquid on its container.

    <p>False</p> Signup and view all the answers

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