18 Questions
What is the unit of pressure in the metric system?
Dynes per square centimeter
What is the formula to calculate the pressure under a column of liquid?
P = ρgh
What is the density of mercury in grams per cubic centimeter?
13.6 g/cm3
What is the unit of pressure in Pascals (Pa) equivalent to?
1 N/m2
What is the range of systolic blood pressure in the human body?
100-140 mm Hg
What is the acceleration due to gravity in centimeters per second squared?
980 cm/s2
What is the unit of pressure when ρ is in kilograms per cubic meter and g is in meters per second squared?
Newtons per square meter
What is the typical pressure in the great veins in the human body?
3-7 mm Hg
What is the difference between pressure and stress?
Pressure is in liquids, stress is in solids
What is the definition of pressure in a gas or liquid?
The force per unit area
What is the unit of pressure in medicine?
Height of a column of mercury (Hg)
What is the equivalent of 1 atm in N/m²?
105 N/m²
What is the peak systolic pressure in mm Hg?
120 mm Hg
What is the formula for pressure?
P = F/A
What is the equivalent of 1 atm in mm Hg?
760 mm Hg
What is the term for the force per unit area in a solid?
Stress
Why do doctors measure blood pressure?
As a part of a physical examination
What is the unit of pressure in which atmospheric pressure is 101325?
N/m²
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.
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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