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Last updated: April 13, 2026

Boiling Point Calculator

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Boiling Point and Pressure

The boiling point of a liquid is the temperature at which its vapor pressure equals the external pressure. The Clausius-Clapeyron equation can be used to estimate the boiling point at different pressures if the heat of vaporization and the normal boiling point are known.

1/T = 1/T₀ − (R × ln(P/P₀) / ΔH_vap)
Standard pressure is 1013.25 hPa (1 atm).
hPa
For water, ΔH_vap ≈ 40.65 kJ/mol.
kJ/mol
For water, T₀ = 373.15 K (100°C).
K
373.15
K
100
°C
212
°F

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