Calculating the Vapour pressure of Water?

Question

I need to calculate the vapour pressure of of water in an experiment I have done for chemistry, and all I have is the tempurature of the water in the particular flask that I am calculating the pressure for, but I don't know how to go about calculating it in terms of Torr.

Answer 1

There is a very good formula here:
http://en.wikipedia.org/wiki/Water_vapor