It really depends on the recipient.
But during my career the most used were single or 1,5 line spacing.
If you need to know how to space in MS Word, click on the related link bellow.
Another Answer
It's a good idea to review the style guide in use by the publisher, professor, reader, reviewer to determine many format criteria for your document.
Originally, a typesetter trained to set type knew -- depending on the type face -- how long to make a line (how wide to set the margins), how much white space to leave between lines (the spacing question, above), all based on the parameters recommended for the human eye to be able to finish one line of text and immediately find the beginning of the next line.
To mimic this skill, set your font size, margins and line spacing on the page so that your document is easy to read. Be consistent about where you place page numbers, foot notes and so forth.
For example, single spaced, Times Roman font set at 8 points with half-inch margins left and right might allow you to cram more text onto a page, but this setup is not easy to read.
The preferred spacing in a document is typically 1.5 or double-spaced to improve readability and make it easier for readers to follow along. It also allows for annotations or comments to be added if needed. However, specific spacing requirements can vary depending on the style guide or formatting guidelines being followed.
Character spacing determines the vertical space of any character in the document.
Word 2007 - Line spacing
fa
No
To change a document from single spacing to double spacing, go to the "Page Layout" or "Layout" tab in your word processing program, find the "Line Spacing" or "Paragraph" section, and select "2.0" or "Double" spacing. This will change the spacing throughout the entire document.
Answer by Semen: Yes, footnotes are single spaced by default regardless of the line spacing of the document text.
line spacing is used in a computer text document (such as Word). it is the space between each line of text examples: 1.5, double spaceing, single spacing.
line spacing is used in a computer text document (such as Word). it is the space between each line of text examples: 1.5, double spaceing, single spacing.
Control 1 sets single line spacing. Control 5 sets 1.5 line spacing. Pressing Control 1.5 will set the document to single line spacing and then to 1.5 line spacing.
Line spacing
paragraph
you highlight you document then you go to line spacing on the toolbar