Which of the following quantity is unitless ?

Options

A. Velocity gradient
B. Pressure gradient
C. Displacement gradient
D. Force gradient

Answer

C

Explanation

Velocity gradient `=(m//s)/( m) = s^(-1)`
Pressure gradient `=(kg //mxs^(2))/( m) = (kg)/(m^(2) xx s^(2))`
Displacement gradient `= (m)/(m)` = unitless
Force gradient `= (kg xx m//s^(2))/(m) = kg//s^(2)`