Water Temperature Under Vacuum?

→ Steam tables.

• "Thermodynamic and Transport Properties of Fluids" by Mayhew & Rogers, Oxford Basil Blackwell 1976
• "Chemical Engineers' Handbook", a.k.a. "Perry", any edition
• "Kempe's Engineers' Year Book" 1998, section F10.

At 0.01°C, the saturation pressure is 0.006112 bara, according to Mayhew & Rogers, top of P2.

Instrument air is dried typically to -40°C dewpoint.

Does that help?

Do you mean 29.98 water inches or 29.98 Hg inches; if the latter, you can't achieve that. BTW, IMHO, this is why the world really needs to use absolute pressure units.

Tom

At theoretical vaccum of 29.92 Hg. water evaporates at 34 degrees F.

Thanks a million PALIURUS

Kind regards

Phil Lyon

Water evaporates at any temperature, except possibly absolute zero. Ice sublimes, which is the same as evaporation. The RATE of evaporation is temperature and pressure dependent.

You got it Cardio07, but I think it's temperature and vapor pressure dependent. Evaporation being stopped at saturation vapor pressure. Being an automation engineer, (playin' with robots) I love you chemical dudes and dudetts.

rt pokin

"Can anyone give me the temperature of water when under a 29.98 inch vacuum please"

Water can not exist under that condition.

At a vacuum of 29.98 " HG, i.e. - 14.7 psig or as low as you can pump a vacuum there will be NO WATER, ONLY ICE. And the ice will be sublimating as fast as it can as it picks up heat from radiation from the container walls and from conduction in contact with the bottom of the vessel.

Thank you stirling stan

Kind regards

Phil Lyon

Stirling gave you the Net result--if you can keep on sucking out all the H₂O.

And the vessel from which you sucked out will soon attain Ambient Temperature.

You can do a neat experiment to see what Stirling says. Put a mirror in the center of a bell jar with a big drop of water on it. An ordinary roughing pump will draw down enough vacuum to freeze the water. The mirror lets you see the ice.

included is a website for getting a WASP (Water and Steam Properties) program if you need varies.

I have found this to be valuable tool

http://www.chempute.com/waspwin.htm

Dear philipilyon,

I presume you are referring to 29.98 Inches of Mercury Column of Vaccuum., which is the ABSOLUTE ZERO PRESSURE and the PRESSURE CANNOT GO BELOW ZERO ABSOLUTE PRESSURE.

DHAYANANDHAN.S