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Young–Laplace Calculator

Compute pressure jump for a droplet ΔP = 2γ/r and a soap bubble ΔP = 4γ/r.

Input Data

Input Surface tension γ.
N/m
Input Radius r.
m

Results

145.6Pa
291.2Pa
droplet ΔP = 2γ/r = 145.6000 Pa, bubble ΔP = 4γ/r = 291.2000 Pa

At a glance:Young–Laplace Calculator: enter parameters to compute results; complements related calculators.

Formula

Droplet: ΔP = 2γ / r

Soap bubble: ΔP = 4γ / r (two interfaces)

How to Use

  1. Enter surface tension γ.
  2. Enter radius of curvature r.
  3. Get droplet and bubble pressure jumps.

Case Studies

Water drop r=1 mm

γ=0.0728 N/m, r=1e-3 m → droplet ΔP=145.6 Pa.

FAQ

Why 4γ/r for a bubble?

A soap bubble has two gas–liquid interfaces, so 2×(2γ/r).

Related Tools

References

Content review: Calculatorism Science Team. Formula and numeric tests verified; results for reference only.

Found a problem with the results?

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