How can I calculate the boiling point of water under vacuum?
2007-05-16 08:28:00 · 4 answers · asked by mmonkeyboy 2 in Science & Mathematics ➔ Engineering
To calculate the Pvap with temperature dependance you can use the Antione equation (perameters should be availble online).
For Pressure dependance of BP, you can actually get experimental data from NIST Webbook.
Check out this Link: http://webbook.nist.gov/chemistry/fluid/
choose water, the units you want, and isothermal
then choose the pressure range for data that you want on the next screen.
Cheers
2007-05-16 08:34:05 · answer #1 · answered by Duff 2 · 0⤊ 0⤋
Vacuum by definition is when you reduce the pressure to 0.
Water (H20) does not exist in the liquid form at any temperature under a pressure of 0.
If you are asking for the temperature for a phase change at vacuum you can use the sublimation temperature (from solid to gaseous form i.e. gas to vapor). The sublimation temperature of ice at complete vacuum is 152 K.
2007-05-16 16:18:28 · answer #2 · answered by mutludo 1 · 0⤊ 0⤋
Get your hands on a Steam Table (Properties of Saturated Steam), which shows the properties of saturated steam.
From this table you can see the pressure for any boiling temperature from 32 Deg F to 212 Deg F, or the boiling temperature for any pressure.
2007-05-16 19:23:04 · answer #3 · answered by gatorbait 7 · 0⤊ 0⤋
The boiling point should be any temperature above freezing for water in a vacuum.
2007-05-16 15:35:17 · answer #4 · answered by Randy G 7 · 0⤊ 1⤋