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Altitude ↔ Boiling Point of Water
Estimate the boiling point of water at any altitude — or vice versa — using the Clausius–Clapeyron approximation with a layered Standard Atmosphere, or a quick linear rule-of-thumb. QA: running…
Result
FAQ
How does altitude affect the boiling point?
Air pressure decreases with height, so water boils at lower temperatures at altitude.
What formula does this use?
Two options:
(1) Physics mode uses a layered U.S. Standard Atmosphere
(0–11 km lapse −6.5 K/km; 11–20 km isothermal at ≈216.65 K; 20–32 km lapse +1.0 K/km)
to compute pressure vs altitude, then applies the Clausius–Clapeyron relation
to convert pressure to water’s boiling point.
(2) A linear rule-of-thumb (~1 °C per ~285 m) for quick estimates.
Accuracy is highest within those layers; extremely high altitudes (e.g. >32 km) are outside this simplified model.
Can it work offline?
Yes — this page is self-contained and cached locally by a Service Worker after your first visit.
Who might find it useful?
Students, mountaineers, engineers, and chefs at altitude.