It is because a body fills up a certain amount of space that it is located in that place and, thereby, not in another place. (faith.org.uk)
Not that I'm complaining so much, it's just that there's only a certain amount of space I have in my cabinets for mugs - you know?! (mostlyhomemademom.com)
Many businesses take for granted that packaging materials have to consume a certain amount of space. (packagingeurope.com)