Rate of flow is defined as the quantity of a fluid flowing per second through a section of a pipe or a channel.
Rate of flow is also known as Discharge Q.
Mathematically,
Rate of flow = Volume / time
Dimensional Formula of Volume = M0L3T0.
Dimensional Formula of time = M0L0T1.
Putting these values in above equation we get,
Dimensional Formula of Rate of Flow= M0L3T-1.
SI unit of Rate of flow is m3s-1