The word-spacing property increases or decreases the white space between words.
Value
Description
(numeric)
e.g. '10' would set the font size to 10 pixels (Microthemer automatically adds the 'px' unit if a unit isn't specified). Other commonly used units include 'em' and '%'. So you could enter '1em' in the Word Spacing field.
Word Spacing
The word-spacing property increases or decreases the white space between words.
Themeover CSS Reference
Online CSS References: Word Spacing