How Long Does Water Take to Evaporate?

  • Context: High School 
  • Thread starter Thread starter Davidrdguez
  • Start date Start date
  • Tags Tags
    Water
Click For Summary

Discussion Overview

The discussion revolves around the time it takes for water to evaporate in a specific scenario involving a small amount of water in a closed container at ambient temperature and pressure. Participants explore factors influencing evaporation rates, including humidity and airflow, while considering both theoretical and practical aspects.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • One participant notes that evaporation time depends on relative humidity and airflow over the water.
  • Another participant mentions that the temperature of exposed water decreases due to evaporation unless the air is saturated with moisture.
  • A participant introduces the concept of pan evaporation, explaining its use in estimating evaporation rates for solar energy and lake evaporation, suggesting it could be relevant to the OP's question.
  • One participant expresses skepticism about the OP's scenario, implying it may be a simple home experiment.
  • The OP clarifies that their situation involves a closed room with normal conditions and no airflow, seeking specific insights for this case.
  • A later reply asserts that pan evaporation principles apply to both indoor and outdoor settings, recommending that the OP search for relevant charts.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the specific evaporation time for the OP's scenario. There are multiple competing views regarding the relevance of pan evaporation and the impact of environmental conditions.

Contextual Notes

Participants note limitations such as the need for specific charts for indoor conditions and the influence of factors like humidity and airflow, which remain unresolved in the discussion.

Who May Find This Useful

This discussion may be of interest to individuals exploring evaporation processes, those conducting home experiments, or anyone studying the effects of environmental conditions on water evaporation.

Davidrdguez
Messages
9
Reaction score
0
Hello everybody,

I'd like to ask a question.

I have one recipient with water, a little water in a box with not very much height as I show in the draw. We have atmospheric pressure and the temperature of the water is the same as the ambient temperature, about 20ºC.

My question is how much time does the water need to get evaporated.

Thanks
 

Attachments

  • water.JPG
    water.JPG
    17.1 KB · Views: 474
Physics news on Phys.org
That will depend on the relative humidity and the rate of flow of fresh air over the water.

I would also like to point out, as an aside, that the temperatue of exposed water always becomes lower than the ambient temp within a short time due to evaporation, unless, of course, the air is saturated with water.
 
Pan evaporation is used to estimate such things as solar energy per sq measure and lake evaporation.

In the solar energy test two pans are used and one is open to the sun while the other is exposed to all the same conditions except that it is under a screen to shield it from the sun. The differential evaporation rate is used to calculate soler energy falling on the pan.

In the lake evaporation test only one pan is used and the time it takes to evaporate it is used to calculate the evaporation rate of the lake.

Below is a useful link for you

http://www-das.uwyo.edu/~geerts/cwx/penpan.html
 
I thought the OP was doing a little home Physics...
 
Shooting star said:
I thought the OP was doing a little home Physics...

That may well be, but the link I provided will prove helpful anyway.
 
again

Good morning,

I was reading the link you gave me but it's for lakes and things like that.

The question I propose it's for one recipient in one room, closed, with a normal temperature, pressure, relative humidity and we can think there isn't a flow of air above it.

Do you know anything about this case?

Thanks
 
The pan evaporation science is the same for indoor as well as outdoor cases. you just ahve to find charts that work for the conditions you want. Just Google for "pan evaporation"
 

Similar threads

  • · Replies 16 ·
Replies
16
Views
7K
  • · Replies 6 ·
Replies
6
Views
3K
  • · Replies 17 ·
Replies
17
Views
2K
  • · Replies 9 ·
Replies
9
Views
4K
  • · Replies 7 ·
Replies
7
Views
2K
  • · Replies 9 ·
Replies
9
Views
4K
  • · Replies 10 ·
Replies
10
Views
3K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 35 ·
2
Replies
35
Views
4K
  • · Replies 8 ·
Replies
8
Views
1K