Medium

 A Space is how you Medium it.
Whether in space, underground or on/in the water.

 The term relevant here is/could be Float.

 The term relevant here is/could be Gravity.

The term relevant here could be Bouyancy or/and High/Low Pressure.

We human are resourceful, enough to path and pave way and surrounding to make ourselves comfortable, and later on, the Space that we thought we create we call it Property.

And we are in debt for it.