Interactive Analysis Tools

Porosimetry Calculators

Essential calculation tools for pore structure analysis. Convert between units, calculate pore sizes from pressure data, determine surface areas, and validate bubble points — all based on industry-standard equations and ISO/ASTM methodologies.

Washburn Pore Size Calculator (MIP)

Calculate pore diameter from mercury intrusion pressure using the Washburn equation

Washburn Equation

d = |4γ cos θ / P|

Where:
d = pore diameter (μm)
γ = surface tension (mN/m)
θ = contact angle (degrees)
P = pressure (MPa)

CALCULATED PORE DIAMETER

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BET Surface Area Calculator

Calculate specific surface area from monolayer capacity and adsorbate properties

BET Equation

S = (Vm × NA × Am) / Mv

Where:
S = surface area (m²/g)
Vm = monolayer volume
NA = Avogadro's number
Am = molecular area
Mv = molar volume (22414 cm³)

BET SPECIFIC SURFACE AREA

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Bubble Point Calculator (CFP)

Calculate largest through-pore diameter from bubble point pressure

Young-Laplace Equation

d = 4γ cos θ / ΔP

For complete wetting (θ = 0°):
d = 4γ / ΔP

Bubble point = largest pore
ASTM F316 standard method

MAXIMUM PORE DIAMETER

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Unit Converters

Quick conversion between common pressure and pore size units

Pressure Converter

Pore Size Converter

Quick Reference

Common Constants & Values

Mercury Properties (20°C)

  • Surface tension: 485 mN/m
  • Contact angle: 130-140°
  • Density: 13.534 g/cm³

N₂ at 77 K

  • Cross-section: 16.2 ų
  • P₀: 101.3 kPa
  • Molar volume: 22414 cm³

Ar at 87 K

  • Cross-section: 13.8-14.2 ų
  • P₀: 246.8 kPa
  • Better for micropores

Constants

  • NA: 6.022 × 10²³
  • R: 8.314 J/(mol·K)
  • 1 atm = 101.325 kPa