Calculate the capillary pressure difference across the interface between two static fluids.
Interface Properties
Pressure Results
Pressure Difference (ΔP)144.00Pascal (Pa)
Pressure vs. Radius
About this calculator
Overview
The Young-Laplace equation describes the capillary pressure difference across curved fluid interfaces. It explains why smaller bubbles require higher internal pressure and why water rises in thin tubes (capillary action).
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Pro Tips
For a spherical bubble/droplet, R1 = R2. Enter one radius and leave the other blank.
A negative radius implies a concave surface (like the meniscus in a tube).
Surface tension of water at 25°C is approximately 0.072 N/m.
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Fun Facts
"Small bubbles in a liquid are under significantly higher pressure than large ones."
"This equation is critical for lung function; surfactant reduces surface tension so alveoli don't collapse."
"Insects can walk on water because the pressure difference created by surface tension supports their weight."
