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Questions and Answers
What is the unit of pressure in the metric system?
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 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 approximate value of acceleration due to gravity in cm/sec2?
What is the normal range of systolic blood pressure in the body?
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?
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?
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?
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?
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)?
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)?
What is the peak systolic pressure in millimeters of mercury (mm Hg)?
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What is the definition of pressure?
What is the definition of pressure?
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What is the unit of pressure that is equal to 1 N/m²?
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.
