Vacuum pressure and water boiling temperature

Vacuum pressure and water boiling/sublimation temperature. Sublimation occurs when pressure is reduced at temperatures below water's freezing point.

Water Boiling Temperature
(oF)
Vacuum Pressure
(in Hg) Microns
212 0 762000
192 10.24 500000
152 22.05 200000
125 25.98 100000
101 27.95 50000
84 28.74 30000
72 29.13 20000
63 29.33 15000
52 29.53 10000
39 29.69 6000
29 29.76 4000
15 29.84 2000
1 29.88 1000
-12 29.90 500
-21 29.91 300
-28 29.91 200
-33 29.92 150
-40 29.92 100
-50 29.92 50
- 29.921 0
  • 0% vacuum = 760 torr = 14.7 psia = 29.92 in mercury abs = 101.4 kPa abs
  • 50% vacuum = 380 torr = 7.3 psia = 15 in mercury abs = 50.8 kPa abs
  • 99.9% vacuum = 1 torr = 0.01934 psia = 0.03937 in mercury abs = 1.3 kPa abs