Boiling point of water at full vacuum

KLITE

Well-Known Member

• Feb 17, 2015

• #1

http://www.jbind.com/pdf/Cross-Reference-of-Boiling-Temps.pdf

So I was thinking that under vacuum molecules behave differently, but i didnt expect the boiling point of water to be at 25C?!
Whats the maximum temperature you've purged at?
Does environmental temperature change under vacuum too or if it does its negligible?

 

Fadedawg

Well-Known Member

• Feb 18, 2015

• #2

Yes, the boiling points are when the vapor pressures reaches atmospheric pressure of 14.7 psi. Reducing the atmospheric pressure, allows them to reach vapor state at lower temperatures.

We purge from 115F to about 160F, depending on what we are doing.

 

7mend07SweetnSticky

Well-Known Member

• Feb 20, 2015

• #3

Uploading a chart. Easy to read. Remember. Its boiling point of water under vacuum pressure (-hg) not boiling point of your oil or bho

 

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Nutes and Nugs

Well-Known Member

• Feb 20, 2015

• #4

What would be a good starter vacuum for small quantities?

 

7mend07SweetnSticky

Well-Known Member

• Feb 20, 2015

• #5

Vac. Works the same for most batches. I usually work with low heat. 90f-115f. No higher than 120f if I can help it and that's after hours under the vac. Its all about the bubbles. But start with -5hg's see how it reacts to your heat.