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Stoichiometry - Engineering

Q1:

Viscosity of 1 centipoise is equal to 1 centis-toke in case of

A water

B mercury

C carbon tetrachloride

D none of these

ANS:A - water

I see, you're asking why the statement "Viscosity of 1 centipoise is equal to 1 centistoke in the case of water" is incorrect. In fluid dynamics, viscosity (𝜂η) and kinematic viscosity (𝜈ν) are related but different properties.

  1. Viscosity (𝜂η): It is a measure of a fluid's resistance to deformation under shear stress. The unit of viscosity is typically expressed in pascal-seconds (Pa·s) in the SI system, or in poise (P) or centipoise (cP) in the CGS system.
  2. Kinematic viscosity (𝜈ν): It is the viscosity of a fluid divided by its density. The unit of kinematic viscosity is typically expressed in square meters per second (𝑚2/𝑠m2/s) in the SI system, or in stokes (St) or centistokes (cSt) in the CGS system.
The relation between viscosity (𝜂η) and kinematic viscosity (𝜈ν) is given by: 𝜈=𝜂𝜌ν=ρη​ Where:
  • 𝜂η = viscosity (in Pa·s or cP)
  • 𝜌ρ = density (in kg/m³ or g/cm³)
Now, for water, the density is approximately 1000 kg/m³ or 1 g/cm³. If the viscosity of water is 1 centipoise (1 cP), then its kinematic viscosity would be: