Boiling point of water by pressure and altitude

Water boils at 100 °C only at about one atmosphere. At lower pressure, on a mountain, it boils at a lower temperature; in a pressure cooker, at a higher one. At exactly one atmosphere (101.325 kPa) it boils at 99.97 °C.

By pressure

$p (kPa)$	$p (bar)$	$p (psi)$	$T_{b} (^{\circ} C)$
$10$	$0.1000$	$1.450$	$45.81$
$20$	$0.2000$	$2.901$	$60.06$
$30$	$0.3000$	$4.351$	$69.10$
$40$	$0.4000$	$5.802$	$75.86$
$50$	$0.5000$	$7.252$	$81.32$
$60$	$0.6000$	$8.702$	$85.93$
$70$	$0.7000$	$10.15$	$89.93$
$80$	$0.8000$	$11.60$	$93.49$
$90$	$0.9000$	$13.05$	$96.69$
$101.325$	$1.013$	$14.70$	$99.97$
$120$	$1.200$	$17.40$	$104.78$
$150$	$1.500$	$21.76$	$111.35$
$200$	$2.000$	$29.01$	$120.21$
$250$	$2.500$	$36.26$	$127.41$
$300$	$3.000$	$43.51$	$133.53$
$400$	$4.000$	$58.02$	$143.61$
$500$	$5.000$	$72.52$	$151.84$
$600$	$6.000$	$87.02$	$158.83$
$700$	$7.000$	$101.5$	$164.95$
$800$	$8.000$	$116.0$	$170.41$
$1000$	$10.00$	$145.0$	$179.89$
$1500$	$15.00$	$217.6$	$198.30$
$2000$	$20.00$	$290.1$	$212.38$
$3000$	$30.00$	$435.1$	$233.86$
$5000$	$50.00$	$725.2$	$263.94$
$10000$	$100.0$	$1450$	$311.00$

By altitude, in the standard atmosphere

$z (m)$	$p (kPa)$	$T_{b} (^{\circ} C)$
$0$	$101.33$	$99.97$
$500$	$95.46$	$98.31$
$1000$	$89.87$	$96.65$
$1500$	$84.56$	$94.98$
$2000$	$79.50$	$93.32$
$2500$	$74.68$	$91.64$
$3000$	$70.11$	$89.97$
$4000$	$61.64$	$86.62$
$5000$	$54.02$	$83.25$
$6000$	$47.18$	$79.88$
$8848$	$31.44$	$70.18$

Notes

The boiling point comes from the IAPWS-IF97 saturation equation. The pressure at each altitude is the ASHRAE standard atmosphere, so on a given day it can differ slightly with the weather.

On the summit of Everest, 8848 m, water boils at about 70 °C, too low to cook an egg normally. A home pressure cooker adds about one bar and raises the boiling point to about 120 °C.

For the reverse, the vapour pressure at each temperature, see the vapor pressure of water table.