Viscosity is a fundamental physical property of fluids that describes their resistance to flow. It is essentially a measure of internal friction within the liquid or gas. High viscosity means a fluid flows slowly (like honey), while low viscosity means... Read More
Viscosity is a fundamental physical property of fluids that describes their resistance to flow. It is essentially a measure of internal friction within the liquid or gas. High viscosity means a fluid flows slowly (like honey), while low viscosity means a fluid flows easily (like water).
The unit of viscosity depends on the system of measurement:
CGS (centimeter-gram-second) system:
The unit is Poise (P).
1 Poise = 1 dyne·second / cm².
In practice, viscosities are often expressed in centipoise (cP), where 1 P = 100 cP. For example, water at 20°C has a viscosity of approximately 1 cP.
SI (International System of Units):
The unit is Pascal-second (Pa·s).
Conversion: 1 Pa·s = 10 P.
Now, examining the options given:
Decibel is a logarithmic unit used to measure sound intensity.
Torr is a unit of pressure (1 Torr = 1/760 of an atmosphere).
Poise is the correct unit of viscosity in the CGS system.
Hertz is a unit of frequency, meaning cycles per second.
Hence, the correct answer is Poise.
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