# Properties of Fluids in Fluid Mechanics

## Mass density (ρ)

Mass density,

The SI unit of density is kg/m

^{3}

Dimensionally, ρ = ML

^{-3}

## Weight density/ specific density (w)

It is defined as the weight per unit volume. Mathematically,Specific density,

Here ρ = mass density and g = acceleration due to gravity.

The unit of specific density is N/m

^{3}

Dimension,

## Specific volume

Dimension: M

^{-1}L

^{3}

## Specific gravity (s)

It is a dimensionless quantity.

## Viscosity (dynamic viscosity, µ)

It is defined as the property of a fluid that offers resistance to the fluid flow.From

**newton’s law of viscosity**,

Dimension, µ = ML

^{-1}T

^{-1}

## Kinematic viscosity (ν)