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How long will a water drop exist until it evaporates based on ambient conditions? I am looking for a simple equation or table that would tell me how long a water drop may exist until it evaporates based on ambient conditions (RH, T etc.)

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closed as too localized by Waffle's Crazy Peanut, user1504, Brandon Enright, twistor59, Alfred Centauri Jun 13 '13 at 23:24

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.

Hi user. Welcome to Physics.SE. This is not a site ran by an individual user. Instead, a community with a number of users. Okay, What do you really ask? In the title, you've asked for the time period, while in the body - you've asked, "I'm looking for..." <-- which makes me think that it's some kinda reference request. What is it? Can you please clarify it for better understanding? ;-) –  Waffle's Crazy Peanut Mar 22 '13 at 16:44
If this is a homework question, please tag it as such. –  MarkWayne Mar 28 '13 at 3:04

2 Answers 2

It would seem the Penman equation or some variant thereof would do what you want provided you are interested in open air conditions. It will give you a rate of evaporation with dimensions of mass per unit time per unit surface area. You can use this to set up a differential equation that describes the mass of the drop as a function of time.

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The growth or shrink rate of water droplets is determined by the Mason equation. This formula takes into account the Kelvin effect, i. e. the change of vapour pressure due to decreased surface tension at curved water surface.

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