What is stress? Write its unit and dimensional formula.

(N/A) Stress is defined as the restoring force per unit area of a body that has been deformed by an external force. Mathematically,$\text{Stress} = \frac{F}{A}$,where $F$ is the restoring force and $A$ is the cross-sectional area.
The $SI$ unit of stress is $\text{Pascal (Pa)}$ or $\text{N/m}^2$.
The dimensional formula of stress is calculated as: $\text{Dimension of Force} = [MLT^{-2}]$ and $\text{Dimension of Area} = [L^2]$.
Therefore,$\text{Dimension of Stress} = \frac{[MLT^{-2}]}{[L^2]} = [ML^{-1}T^{-2}]$.