Volume of Water Uptake Calculator
💧 Diffusion, osmosis & transport. Use the Volume of water uptake (potometer bubble) formula to find volume, capillary radius, distance moved: pick the value you want, type the others, and the answer updates as you go.
r = the radius of the capillary tube, d = the distance the bubble moved.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Volume | mm³ |
| Capillary radius | mm |
| Distance moved | mm |
Worked example
Find the volume when Capillary radius = 0.5 mm, Distance moved = 40 mm.
Using V = π r² d: Volume = 31.416 mm³.
Frequently asked questions
What is the formula for Volume of water uptake (potometer bubble)?
V = π r² d. r = the radius of the capillary tube, d = the distance the bubble moved.
What do the letters stand for, and what units are used?
Volume in mm³, Capillary radius in mm, Distance moved in mm.
How do you calculate volume?
Put the values into V = π r² d. For example, with Capillary radius = 0.5 mm, Distance moved = 40 mm, volume = 31.416 mm³.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (volume, capillary radius, distance moved) and fill in the others: it rearranges the formula for you.
