Update app.py

app.py

@@ -103,6 +103,7 @@ with gr.Blocks() as demo:
     gr.Markdown("# Bernoulli Pipe Flow Calculator")
     gr.Markdown("This Space hosts a Bernoulli pipe flow calculator for calculating the pump head loss for an internal flow system through a pipe. An example of one such pipe system is shown below. To utilize this calculator, simply fill in the required system metrics and hit 'compute'.")
     gr.Image("bernoulli.png", label="Bernoulli Diagram", show_label=True)
+    gr.Markdown("NOTE: Roughness (ε) in pump head loss calculations, measured in meters, represents the average height of internal surface irregularities (like ribs or grooves) in a pipe, which contributes to friction and thus head loss. This absolute roughness is used with the pipe's diameter (D) to calculate relative roughness (ε/D), a key factor, along with the Reynolds number, in determining the Darcy friction factor (f, an output of this calculator) needed for the Darcy-Weisbach equation to find major frictional head losses in a pipe system. ")
     with gr.Row():
         with gr.Column(scale=2):
             P1 = gr.Number(value=101325, label='P1 [Pa]')