What is dimensional analysis? Write the limitations of dimensional analysis.

(N/A) Dimensional analysis is a method used to check the consistency of physical equations,derive relationships between physical quantities,and convert units from one system to another based on the dimensions of the quantities involved.
Limitations of dimensional analysis:
$(1)$ In dimensional equations containing $M, L,$ and $T$,we can obtain at most three equations by equating the indices of $M, L,$ and $T$. Hence,this method is of no avail in deducing the exact form of a physical relation that depends on more than three independent physical quantities.
$(2)$ Information about dimensionless constants (such as $\pi, e,$ or numerical coefficients) cannot be obtained using this method.
$(3)$ Equations containing exponential,logarithmic,or trigonometric functions lie outside the scope of this method.
$(4)$ This method is not useful if the constant of proportionality is not dimensionless.