I don't understand units associated with kinematic viscosity. Let's recap dynamic viscosity (η): η = Shear stress (τ) / rate of shear strain (m/s)/m) η = F/A / (velocity (m/s) / gap distance (m)) η = Force( N) / Area (m2) / (velocity (m/s) / gap distance (m)) Stress (F/A) is pressure, Newtons per metre squared, so unit is Pascals. When you cancel the two m's out in the divisor, you are left with: η = N/m2 or Pascals / s (Pascal Seconds). The equation to convert dynamic viscosity to kinematic velocity is: ν = η / ρ ν = η N m-2 s / ρ Kg m-3 I get this. The numerator is saying Newtons per square meter (pressure in Pascals) per second (Pascal seconds) and the divisor is saying Kg per cubic metre) Since 1 Kg = N m-1 s2, this simplifies to dimesions of m2 s-1 I don't get how things simplify. I know that the Stoke is the unit, and it's a unit of position and time. Thanks.