Water and gas phase environment


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Just Got Here
Dear friends,
    i am a new bie to Nwchem and Qm. I went through the Manual of Nwchem but 
I have few questions.

1. How to add water in calculation
2. How to do optimization all the calculations
    in water environment or gas phase.


I accept apology that it may be present in
manual but I not find the direct answer to it.

I will be thankful to the answer..