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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?
- 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?
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?
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?
What is the unit of pressure in Pascals (Pa) equivalent to?
What is the range of systolic blood pressure in the human body?
What is the range of systolic blood pressure in the human body?
What is the acceleration due to gravity in centimeters per second squared?
What is the acceleration due to gravity in centimeters per second squared?
What is the unit of pressure when ρ is in kilograms per cubic meter and g is in meters per second squared?
What is the unit of pressure when ρ is in kilograms per cubic meter and g is in meters per second squared?
What is the typical pressure in the great veins in the human body?
What is the typical pressure in the great veins in the human body?
What is the difference between pressure and stress?
What is the difference between pressure and stress?
What is the definition of pressure in a gas or liquid?
What is the definition of pressure in a gas or liquid?
What is the unit of pressure in medicine?
What is the unit of pressure in medicine?
What is the equivalent of 1 atm in N/m²?
What is the equivalent of 1 atm in N/m²?
What is the peak systolic pressure in mm Hg?
What is the peak systolic pressure in mm Hg?
What is the formula for pressure?
What is the formula for pressure?
What is the equivalent of 1 atm in mm Hg?
What is the equivalent of 1 atm in mm Hg?
What is the term for the force per unit area in a solid?
What is the term for the force per unit area in a solid?
Why do doctors measure blood pressure?
Why do doctors measure blood pressure?
What is the unit of pressure in which atmospheric pressure is 101325?
What is the unit of pressure in which atmospheric pressure is 101325?
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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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