How to use the vapor pressure at another temperature calculator
Estimate a liquid vapor pressure at a new temperature from its enthalpy of vaporization. Enter known vapor pressure, known temperature, new temperature, enthalpy of vaporization in the fields above; the vapor pressure at new temperature is computed instantly and plotted on the chart so you can see how the answer changes.
Common searches this calculator answers include “clausius clapeyron”, “vapor pressure change”, “boiling point pressure”, “calculate vapor pressure at another temperature”, “find vapor pressure at new temperature”.
Formula
Variables
- P1 — Known vapor pressure (kPa)
- T1 — Known temperature (K)
- T2 — New temperature (K)
- dH — Enthalpy of vaporization (J/mol)
Worked example
With known vapor pressure = 101.3 kPa, known temperature = 373.15 K, new temperature = 353.15 K, enthalpy of vaporization = 40660 J/mol, the calculator gives vapor pressure at new temperature ≈ 48.22546 kPa.
Frequently asked questions
What is the vapor pressure at another temperature calculator used for?
Estimate a liquid vapor pressure at a new temperature from its enthalpy of vaporization. It helps with questions such as “clausius clapeyron”, “vapor pressure change”, “boiling point pressure”.
What is the formula for the vapor pressure at another temperature calculation?
Vapor pressure at new temperature (kPa) = P1 × exp(-dH / RGAS × (1 / T2-1 / T1)). Here P1 is known vapor pressure (kPa), T1 is known temperature (K), T2 is new temperature (K), dH is enthalpy of vaporization (J/mol).
What inputs do I need for the vapor pressure at another temperature calculator?
You need known vapor pressure in kPa, known temperature in K, new temperature in K, enthalpy of vaporization in J/mol. Each field is pre-filled with a typical example so you can see how the result responds as you edit the numbers.
How do I use the vapor pressure at another temperature calculator?
Type values into the input fields. Results and the chart update instantly. Use Reset to restore the example values, Copy results to paste them elsewhere, or Share to copy a link that preserves your inputs.
Is the vapor pressure at another temperature result exact?
Calculations use standard formulas and double-precision arithmetic, then display about seven significant figures. Real-world measurements carry uncertainty, so treat results as estimates unless your inputs are exact.