[wiserd]

This website gives the following vapor pressure for a molecule;

Vapour Pressur    2.27E-07mmHg at 25°C
http://www.chemnet.com/dict/dict--12041-97-3--en.html


e = 2.718 (right?)

so this means 2.27 * e^ -07

right?

and a number like 2.27 * e ^ -05 would be a larger number, right?


. I think I'm doing something wrong, because this would indicate that  the "wrong" molecule is evaporating the most rapidly.

[Borek]

No, 2.27E-07 means 2.27×10^-7. It is a version of scientific notation used to express floating point numbers, dated to ancient computer times when the only way to output calculation results was using ASCII symbols without any subscripts, superscripts and other fancy things. E means just "exponential", it has nothing to do with e.

Rather low number, not a large one.