If you are referring to the automatic replacement that occurs in Microsoft Word, the two dashes change to what is called an em dash.
When text is followed by two hyphens and then a space, the two hyphens are often changed to an em dash (—) in some word processing programs and websites with automatic formatting. It is used to indicate a break in thought or emphasize a statement within a sentence.
Because hyphens are dashes. Word changes double dashes into em dashes (the long dashes) automatically if there is a space before and after the double dash.
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An obvious example would be the computer/laptop/whatever you are typing into! Mass is defined as an object's resistance to changes in motion in its most simple form in Physics, or, perhaps, you have have learned it as the amount of matter in something. Well, going by the former definition, the computer you are typing into has mass because it resists changes in position, and it also takes up space (obviously).
It would be text. However, if there are just numbers and a hypen or hyphens, then the hyphens could be a minus sign and you would get a formula if you put an equals sign before it.
In standard prose typing, you space twice after a period.
The so-called "em dash" (kind of like a very long hyphen) is normally automatically created in some word processing software (such as Microsoft Word®). If this option is unavailable to you, you can hold the alt key and type 0151 on your number keypad and then release the alt key.
they use in typing words and numbers.
When typing, a single space comes after the word in the sentence.
try typing in "what is an astronauts space suite made of
Typing the character entity   renders a non-breaking space, a fixed-width space that will not be used as a potential line break position.
It is nine hundred eighty followed by a space followed by three.