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From: Timo Nieminen on 30 Mar 2010 18:35
On Tue, 30 Mar 2010, 7 wrote:

> Anyone knowledgeable about lowest viscosity fluid at room temperature and
> atmospheric pressure?
> ------------------------------------------------------------------------
>
> Wikipedia lists Acetone, but I'm after something a lot better
> (preferably commercially available stuff).

Pentane beats acetone, about 0.24 cP, and has a boiling point of above
room temperature. The lighter hydrocarbons probably have lower viscosity,
but also lower boiling points.

Lowest I know of is dimethyl ether, 0.22 cP. Again, going to light
molecules lowers this, e.g., dimethyl ether about 0.2 cP, but BP below
room temp.

For a normal liquid, you're aren't going to beat gasses, typically
about 0.02 cP iirc. Add the extra intermolecules forces which make it a
liquid and not a gas, you you increase this. Reduce the intermolecular
forces, and you lower the BP. Given that the above examples with
viscosities lower than acetone also have BPs lower than acetone, I don't
think you'll do significantly better with anything commercially available.

--
Timo
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