Physical Chemistry calculators
9 calculators Half-Life Calculator Solve radioactive decay for remaining amount, elapsed time, or half-life. Also converts between half-life, decay constant, and mean lifetime with a decay schedule.
Open Partial Pressure Calculator Calculate partial pressure using Dalton's law, the ideal gas law, or Henry's law. Supports 5 pressure units, multi-component breakdown, and reverse-solve.
Open Radioactive Decay Calculator Calculate remaining amount, activity in Bq/Ci, mean lifetime, and specific activity. Solve for time, half-life, or initial quantity with isotope presets.
Open Diffusion Coefficient Calculator Calculate the diffusion coefficient using Stokes-Einstein, Fick's First Law, diffusion time scaling, or mean squared displacement. Switch units instantly.
Open Langmuir Isotherm Calculator Calculate Langmuir adsorption: solve for q, Ce, qmax or KL, get the separation factor RL, linearized Ce/q form, mass-balance mode, and isotherm curve chart.
Open Osmotic Pressure Calculator Calculate osmotic pressure with the van't Hoff equation from solute concentration, temperature, and dissociation factor. Results in Pa, bar, atm, kPa, mmHg, or psi.
Open Rate of Effusion Calculator (Graham's Law) Calculate the rate of effusion or diffusion of any two gases using Graham's Law. Solve for rate ratio, unknown molar mass, or time ratio with step-by-step working.
Open Two-Photon Absorption Calculator Calculate photon flux, excitations per molecule, and peak intensity for two-photon absorption from cross section (GM), laser power, wavelength, and focus size.
Open Young-Laplace Equation Calculator Calculate capillary pressure across curved fluid interfaces with the Young-Laplace equation. Spherical, cylindrical, general, and capillary rise modes included.
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