How to use the droplet laplace pressure calculator
Find the extra pressure inside a small liquid droplet from its surface tension and radius. Enter surface tension, droplet radius in the fields above; the excess pressure inside droplet, excess pressure are computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “droplet pressure”, “Laplace pressure”, “small drop internal pressure”, “calculate droplet laplace pressure”, “find excess pressure inside droplet”.
Formula
Variables
- sg — Surface tension (N/m)
- r — Droplet radius (µm)
Worked example
With surface tension = 0.072 N/m, droplet radius = 10 µm, the calculator gives excess pressure inside droplet ≈ 14,400 Pa; excess pressure ≈ 14.4 kPa.
Frequently asked questions
What is the droplet laplace pressure calculator used for?
Find the extra pressure inside a small liquid droplet from its surface tension and radius. It helps with questions such as “droplet pressure”, “Laplace pressure”, “small drop internal pressure”.
What is the formula for the droplet laplace pressure calculation?
Excess pressure inside droplet (Pa) = 2 × sg / (r × 1e-6). Excess pressure (kPa) = [Excess pressure inside droplet] / 1000. Here sg is surface tension (N/m), r is droplet radius (µm).
What inputs do I need for the droplet laplace pressure calculator?
You need surface tension in N/m, droplet radius in µm. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the droplet laplace pressure calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the droplet laplace pressure result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.