In Chapter $3$ we study the relationship between velocity, diameter, and flow rate in a circular pipe.

Create a tool in Excel that will use an input flowrate to calculate the upstream and downstream velocity in a pipe that has a change in diameter. The workbook will need to be able to handle both Imperial and Metric units, this can be done with a dropdown box, a macro, different units on different worksheets, or other ways. Please note that different unit systems will have different conversions so it may be more complicated than just re$-$using the same equations. Pay close attention to the required units for inputs and outputs.

Provide the user the ability to input the following $($Imperial units, Metric units$)$:

Flowrate $($Q$)($GPM$,$ LPM$).$

Upstream and Downstream pipe diameters $(D_1,D_2)($in$,($:$mm$