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Questions and Answers
What is the unit of pressure in the metric system?
What is the formula to calculate the pressure under a column of liquid?
What is the approximate value of acceleration due to gravity in cm/sec2?
What is the normal range of systolic blood pressure in the body?
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What is the unit of density of a liquid when the unit of pressure is N/m2?
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What is the normal range of venous blood pressure in the body?
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What is the force per unit area referred to in a solid?
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What is the unit of pressure commonly used in medicine?
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What is the equivalent of 1 atmosphere (atm) in Newtons per square meter (N/m²)?
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What is the peak systolic pressure in millimeters of mercury (mm Hg)?
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What is the definition of pressure?
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What is the unit of pressure that is equal to 1 N/m²?
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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 the definition of pressure, atmospheric pressure, and its units. Understand the formula and conversions between different units.
