The unit of the following property is not m2/sa)Thermal diffusivityb)Kinematic viscosityc)Dynamic viscosityd)Mass diffusivityCorrect answer is option 'C'. Can you explain this answer?

Question

Answer

Dynamic Viscosity

Dynamic viscosity is a measure of a fluid's resistance to shear or flow. It is the ratio of the shear stress to the velocity gradient in a fluid. The unit of dynamic viscosity is Pascal-second (Pa·s) in the International System of Units (SI). This unit can also be expressed as N·s/m^2.

Explanation:

- Thermal Diffusivity: The unit of thermal diffusivity is m^2/s. It represents the ability of a material to conduct heat relative to its ability to store heat.

- Kinematic Viscosity: The unit of kinematic viscosity is m^2/s. It is the ratio of dynamic viscosity to density, representing the fluid's resistance to flow under the influence of gravity.

- Dynamic Viscosity: The unit of dynamic viscosity is Pascal-second (Pa·s) or N·s/m^2. It quantifies a fluid's internal resistance to flow when subjected to shear stress.

- Mass Diffusivity: The unit of mass diffusivity is m^2/s. It characterizes the rate at which particles or molecules diffuse through a medium.

In conclusion, while thermal diffusivity, kinematic viscosity, and mass diffusivity are measured in m^2/s, dynamic viscosity is measured in Pascal-second (Pa·s) or N·s/m^2. This distinction is important in fluid dynamics and heat transfer analyses.

Answer

Thermal diffusivity,

Kinematic viscosity,

Dynamic viscosity, μ has unit Pa.S
Mass diffusivity has also unit of (m²/S)

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