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Thank you, Stfen, I have already noticed this aspect. I think in haste I have posted.

I am using revetx and new to LATEX. I could obtain pdf output by running the file every time, but can't save pdf file as a separate copy. I could take the print of the pdf file, but not able to save the pdf document (for example "save as..as in case of word). Please suggest a method to save the ...

Hai Stefan, I am new to LATEX. But excited by its power. I am using \documentclass [10pt]{revtex4}.
What I did - introduced the command \Large after the \begin{document}, it worked.
Is it OK? Wish to know your comments.

I wish to have the document of larger size font (say 16).

I would like to know how I can get the font size of the pdf output in LATEX. Presently the font size is 8. I have increased in the terminal to 12, but the font size of output document is still 8.It is too small to read.