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Does water evaporate at a set rate? For example, if you had an inch of water and the temperature was 50 degrees how fast would it go and would it evaporate twice as fast at 100 degrees?

asked in Water, science, evaporation

seacommander answers:

The depth of water is largely irelevant since evaporation can only take place at the surface. All other conditions remaining constant, water will evaporate faster the hotter it gets. Looking at the graph of vapour pressure versus temperture in this Wiki article I would estimate that water would evaporate about 8 times faster at 100 degrees (when it would be boiling if we are talking degrees C) than it would at 50 degrees.


Supplement from 01/23/2009 11:00pm:

Here's the vapour pressure graph. At 50 degrees the VP is about 100 torr and at 100 degrees is just short of 800 torr

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Messerwisser answers:

Another important factor is the moisture content in the surrounding air. If the air is dry it enhances evaporation. Saturated air stops it.

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P-Kasso answers:

Altitude will also massively affect the answer to your question.

Water evaporates (and boils) at a far higher temperature depending on the altitude at which you are doing all your evaporating and boiling.

The boiling point of 100C is significantly always quoted as being the boiling point at Sea Level.

As I discovered when casually boiling eggs for a snack at the top of a mountain in Norway, the higher you go the higher the temperature at which water boils - so eggs take longer.

For all thoise IQers who are avid high-mountain egg boilers or dedicated evaporation watchers, Wiki has the answers and a dauntingly complex mathematical equation. Multiply their answer by two if you are partial to double-yolked eggs.


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