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If a rectangular object has an area of four square units, the object could be square and two units on all sides; or it could be a rectangle one unit by four units, or an infinite number of other shapes (a circle with diameter four divided by pi). If an object is four units squared then it is a square with an area of four time four = sixteen units.
The volume of an object.
Liter
There are 2 units in the number.
The mass doesn't change; just the numbers.