10 Questions
What is the SI unit of pressure?
Newton per square meter (N/m2)
What is gauge pressure?
Pressure relative to the ambient pressure
What is the traditional unit of pressure in the imperial and US customary systems?
Pound-force per square inch (psi)
Which unit is defined as 1⁄760 of standard atmospheric pressure?
Torr
How are manometric units used to express pressure?
In terms of the height of a column of a particular fluid in a manometer
What is the symbol most often used for density?
Ρ (the lower case Greek letter rho)
How is density mathematically defined?
Mass divided by volume
What is specific weight often loosely defined as in some cases?
Weight per unit volume
What is the densest known element at standard conditions for temperature and pressure?
Osmium
For a pure substance, what does the density have the same numerical value as?
Mass concentration
Study Notes
Pressure
- The SI unit of pressure is the pascal (Pa).
- Gauge pressure is the pressure measured relative to atmospheric pressure.
Imperial and US Customary Systems
- The traditional unit of pressure in the imperial and US customary systems is the pound per square inch (psi).
Manometric Units
- Manometric units, such as millimeters of mercury (mmHg) or inches of water, express pressure in terms of the height of a column of fluid that produces an equivalent pressure.
Density
- The symbol most often used for density is ρ (rho).
- Density is mathematically defined as mass per unit volume (ρ = m/V).
- In some cases, specific weight is loosely defined as the weight per unit volume of a substance.
Density of Elements
- The densest known element at standard conditions for temperature and pressure is osmium (Os).
- For a pure substance, the density has the same numerical value as its specific weight.
Test your knowledge of pressure with this informative quiz. Explore the concept of pressure, gauge pressure, and various units used to express pressure, including the SI unit of pressure, the pascal (Pa).
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