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Prevent evaporation? Answered

I am planing on doing an experiment but I need to make sure that none evaporates over a few ours, how do id do this?

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icengBest Answer (author)2011-05-15

I presume you are concerned about H2O evaporation.
What does Not work is enclosing a smaller volume around your experiment.
The easy key is to find an immiscible liquid to float on top
( less dense ) of your H2O and block evaporation. 
After that finding more solutions ( keys ) starts to get NASA complicated.

A

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aasil the don (author)2015-07-25

we can also stop the evopartion by poring some amount of oil in water

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rickharris (author)2011-05-15

It dep3nds on how you define none evaporates - eg if you just need to keep it in a container then seal the top - if you mean none to leave the body of liquid then much harder.

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aeray (author)rickharris2011-05-16

Excellent unintentional 1337-speak, Rick.

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rickharris (author)aeray2011-05-16

Doh! :-) editing replies would be nice.

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acidbass (author)2011-05-16

Put some clingwrap (or plastic wrap) over the top of what you are doing

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Arano (author)2011-05-16

it's easy: just make sure the partial pressure of your substance is higher than its vapor pressure

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seandogue (author)2011-05-16

Keep the temperature low and keep the fluid in a sealed container.

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FoolishSage (author)2011-05-16

Keep the surface of your fluid covered and keep it as cold as possible

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steveastrouk (author)2011-05-16

If its water, there are a couple of classic methods. Balls and oil.

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