Pressure and Atmospheric Pressure
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Pressure and Atmospheric Pressure

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Questions and Answers

What is the unit of pressure in the metric system?

  • Pounds per square foot
  • Dynes per square inch
  • Newtons per square meter
  • Dynes per square centimeter (correct)

    • What is the formula to calculate the pressure under a column of liquid?

  • P = ρh/g
  • P = ρ/g
  • P = ρgh (correct)
  • P = g/ρh

    • What is the density of mercury in grams per cubic centimeter?

  • 15 g/cm3
  • 13.6 g/cm3 (correct)
  • 20 g/cm3
  • 10 g/cm3

    • What is the unit of pressure in Pascals (Pa) equivalent to?

    <p>1 N/m2</p> Signup and view all the answers

    What is the range of systolic blood pressure in the human body?

    <p>100-140 mm Hg</p> Signup and view all the answers

    What is the acceleration due to gravity in centimeters per second squared?

    <p>980 cm/s2</p> Signup and view all the answers

    What is the unit of pressure when ρ is in kilograms per cubic meter and g is in meters per second squared?

    <p>Newtons per square meter</p> Signup and view all the answers

    What is the typical pressure in the great veins in the human body?

    <p>3-7 mm Hg</p> Signup and view all the answers

    What is the difference between pressure and stress?

    <p>Pressure is in liquids, stress is in solids</p> Signup and view all the answers

    What is the definition of pressure in a gas or liquid?

    <p>The force per unit area</p> Signup and view all the answers

    What is the unit of pressure in medicine?

    <p>Height of a column of mercury (Hg)</p> Signup and view all the answers

    What is the equivalent of 1 atm in N/m²?

    <p>105 N/m²</p> Signup and view all the answers

    What is the peak systolic pressure in mm Hg?

    <p>120 mm Hg</p> Signup and view all the answers

    What is the formula for pressure?

    <p>P = F/A</p> Signup and view all the answers

    What is the equivalent of 1 atm in mm Hg?

    <p>760 mm Hg</p> Signup and view all the answers

    What is the term for the force per unit area in a solid?

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

    Why do doctors measure blood pressure?

    <p>As a part of a physical examination</p> Signup and view all the answers

    What is the unit of pressure in which atmospheric pressure is 101325?

    <p>N/m²</p> Signup and view all the answers

    Study Notes

    Pressure

    • Pressure is defined as the force per unit area in a gas or a liquid, and it is referred to as stress in solids.
    • The formula for pressure is P = F/A, measured in units of N/m² or dynes/cm².

    Atmospheric Pressure

    • Atmospheric pressure is due to the weight of the air in the atmosphere.
    • 1 atm is equal to 101325 N/m², 105 N/m², or 105 Pa.
    • 1 atm is also equal to 760 mmHg.

    Units of Pressure

    • Units of pressure can be atm, Pascal (Pa), N/m², or dynes/cm².
    • In medicine, the unit of pressure is measured by the height of a column of mercury (Hg).
    • 1 Pa (Pascal) is equal to 1 N/m².

    Pressure under a Column of Liquid

    • Pressure under a column of liquid is given by the formula P = ρgh.
    • ρ is the density of the liquid, g is the acceleration due to gravity, and h is the height of the column.

    Measurement of Body Pressure

    • Pressure is a common phenomenon in daily life, and doctors measure blood pressure as part of a physical examination.
    • The peak systolic pressure is 120 mm Hg, which is equivalent to a pressure of a liquid mercury of this height on its base.
    • The atmospheric pressure is equal to 760 mm Hg.

    Typical Pressures in the Body

    • Arterial blood pressure: 100-140 mm Hg (maximum/systolic), 60-90 mm Hg (minimum/diastolic).
    • Venous blood pressure: 3-7 mm Hg.

    Sphygmomanometer

    • Not mentioned in the provided text, but it is a device used to measure blood pressure.

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    Description

    Learn about pressure, atmospheric pressure, and its units. Understand the formula for pressure, and the different units used to measure it.

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