Boiling Point Calculator

Boiling Point: -- °C

What is this calculator used for?

This Boiling Point Calculator helps you determine the boiling point of a liquid at a pressure different from its normal boiling point pressure. This is useful in chemistry labs, distillation processes, and altitude-related applications.

How to use this calculator

  • Enter the normal boiling point of the substance in °C (typically at 760 mmHg).
  • Enter the current or ambient pressure in mmHg.
  • The calculator will instantly display the adjusted boiling point.

Formula used:

T₂ = 1 / [(1/T₁) - (R × ln(P₁/P₂) / ΔHvap)]

Where:
T₁ = Normal boiling point in Kelvin
T₂ = Adjusted boiling point in Kelvin
P₁ = Normal pressure (760 mmHg)
P₂ = New pressure (mmHg)
ΔHvap = Enthalpy of vaporization (assumed 40.7 kJ/mol for water)
R = 0.008314 kJ/mol·K

Example:

If water has a normal boiling point of 100°C and the pressure is 600 mmHg,
the boiling point will be lower than 100°C. This calculator will compute the value for you automatically.