The formula to calculate the orifice velocity is:
\[ \text{VO} = \frac{\text{OF}}{\text{OA}} \]
Where:
An orifice velocity is a measure of the velocity of fluid moving through an orifice.
Example:
Calculation:
\[ \text{VO} = \frac{0.5}{0.1} = 5 \text{ m/s} \]