Air pressure dependent water evaporation

  • Thread starter lesy1
  • Start date
  • #1
12
0

Main Question or Discussion Point

Imagine a water basin, surrounded by air. How does evaporation speed of water change if the air pressure of surrounding air is 1.000Pa, 10.000Pa, 100.000Pa, 1.000.000Pa, 10.000.000Pa. What is an order of magnite of the evaporation speed change. Where can I read more about that?
Regards.
 

Answers and Replies

  • #2
cjl
Science Advisor
1,860
430
The surprising answer is that it doesn't change. The evaporation speed is dependent on the partial pressure of the water vapor above it, not the total pressure of the air.

The exception to this is if the air pressure is lower than the water's vapor pressure. Then the water will boil, which significantly increases its evaporation speed (I don't know an exact number though).
 
  • #3
12
0
Does there exist any liquid which would change the evaporation speed as a function of air pressure?
 
  • #4
Bystander
Science Advisor
Homework Helper
Gold Member
5,189
1,211
The surprising and incorrect answer is that it doesn't change. (snip)
You are looking for the "Poynting correction."
 

Related Threads on Air pressure dependent water evaporation

Replies
4
Views
905
  • Last Post
Replies
6
Views
2K
  • Last Post
Replies
5
Views
1K
  • Last Post
Replies
1
Views
1K
  • Last Post
Replies
1
Views
3K
  • Last Post
Replies
2
Views
2K
  • Last Post
Replies
14
Views
8K
  • Last Post
Replies
2
Views
1K
Replies
1
Views
2K
Replies
1
Views
2K
Top