Sciencemadness Discussion Board

Vacuum Calculations

1281371269 - 30-9-2010 at 09:32

Today I finally got the voltage adaptor for my vacuum pump and turned it on. Not particularly exciting, and from the looks of things suitable neither for reduced pressure distillations (too weak a vacuum) or for acting as the extractor unit in the fume hood I'm building (too little airflow).

The literature claims the pump produces a vacuum of 280mbar of mercury. How would I calculate the boiling point of water at this pressure so I can test the pump experimentally?

1281371269 - 30-9-2010 at 09:56

Thanks. How do I convert mbar to torr?
Edit: Ignore that question. Converted it online, it's 210.

[Edited on 30-9-2010 by Mossydie]

Magpie - 30-9-2010 at 09:58

I think I can find a better plot for the temperatures near room temperature.

Again from Wiki:

[Edited on 30-9-2010 by Magpie]

Attachment: Pressure units.doc (33kB)
This file has been downloaded 515 times

This looks more useful:

http://intro.chem.okstate.edu/1515sp01/database/vpwater.html

[Edited on 30-9-2010 by Magpie]