Clausius–Clapeyron Vapor Pressure — water
Estimate the vapor pressure of water at a new temperature from a known point and its heat of vaporization. ln(P₂/P₁) = −ΔHvap/R·(1/T₂ − 1/T₁).
- 1ln(P2/P1) = −ΔHvap/R·(1/T2 − 1/T1)
P2 = 2.334
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Cite this tool
ToolJolt. Clausius–Clapeyron Vapor Pressure — water. ToolJolt Chemistry & Lab Tools; 2026. https://tooljolt.comA no-nonsense clausius–clapeyron vapor pressure — water built for chemical thermodynamics and kinetics. It shows the substituted formula, not just the answer, so you can check the working.
About Clausius–Clapeyron Vapor Pressure — water
Estimate the vapor pressure of water at a new temperature from a known point and its heat of vaporization. ln(P₂/P₁) = −ΔHvap/R·(1/T₂ − 1/T₁). The calculation uses ln(P₂/P₁) = −ΔHvap/R·(1/T₂ − 1/T₁). Why this calculation counts: Whether a reaction is spontaneous, how fast it goes, and how its equilibrium shifts with temperature all flow from a handful of equations. Sign and unit errors here are notoriously easy to make. Use consistent pressure units; the ratio is what matters. Common pitfalls to avoid: using °C instead of K; dropping the minus sign in ΔG = ΔH − TΔS; confusing rate constant with equilibrium constant. All maths runs locally in your browser; no data is ever sent to a server. That privacy is exactly why researchers link these calculators from protocols, theses and standard operating procedures.
How to use Clausius–Clapeyron Vapor Pressure — water
- 1Enter your values: Known pressure P₁, ΔHvap, Temperature T₁, Temperature T₂.
- 2Read the headline result and the supporting figures, which recompute as you type.
- 3Open “Worked example with your numbers” to see the substituted formula step by step.
- 4Copy the result, or use the cite-this-tool snippet for your methods section.
Why use Clausius–Clapeyron Vapor Pressure — water?
- ✓Links to related chemical thermodynamics and kinetics calculators so you can finish the whole workflow
- ✓Copy-ready result and a one-line “cite this tool” snippet for your methods section
- ✓Designed for physical chemists, students and process scientists who need a trustworthy answer fast
- ✓Instant, client-side result — works offline once loaded and keeps your data private
- ✓Shows the worked example step by step with your own numbers, not just a final figure
Frequently asked questions
Any tips specific to this calculation?+
Use consistent pressure units; the ratio is what matters. Also watch out for: using °C instead of K and mixing J and kJ for ΔH vs ΔS.
Is this clausius–clapeyron vapor pressure — water free to use?+
Yes. It is completely free, needs no sign-up, and runs entirely in your browser — there are no usage limits.
What formula does it use?+
It uses ln(P₂/P₁) = −ΔHvap/R·(1/T₂ − 1/T₁) The full worked example is shown beneath the result so you can verify each step.
What are the most common mistakes here?+
In chemical thermodynamics and kinetics, watch for: mixing J and kJ for ΔH vs ΔS; using °C instead of K; dropping the minus sign in ΔG = ΔH − TΔS; confusing rate constant with equilibrium constant. This tool shows the working so you can catch these before they cost an experiment.
Does my data leave my device?+
No. All computation happens locally in your browser. Nothing you enter — sequences, concentrations or measurements — is uploaded to any server, so it is safe for confidential work.
Can I cite this tool?+
Yes — use the “Cite this tool” snippet on the page. Many users link these calculators from methods sections, lab SOPs and teaching materials.
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