15 cubic units.
A millilitre is a unit of volume. A metre is a unit of length. The two units are therefore incompatible.
Cube one's volume = 9*9*9 = 729 cubic units. As there are two cubes, their volumes added together = 1458 cubic units.
One liter is equivalent to 1000 milliliters.
A half pint is a unit of volume. 6 inches is a unit of length. The two units are not comparable.
Volume = (length) x (width) x (height)
In general the larger the perimeter (of a flat shape) the greater the area. Given two congruent shapes the one with the larger perimeter has a greater area.But two shapes that are not congruent (or almost so) do not follow this rule: for example a rectangle fifteen units long and one unit wide has an area of 15 square units and a perimeter of 32 units. While a square with edges four units has an area of sixteen square units (one more than the other rectangle) but a perimeter of only sixteen units (half that of the long thin rectangle).So too with surface area and volume. Of two congruent 3 dimensional shapes, the one with the larger volume will also have a larger surface area.
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Density = Mass/Volume. Conversion between units will depend on what the two units are.
These are two different units of measure (volume and weight/mass) that do not convert to one another.
direct measurement and displacement
Surface area is two-dimensional. Volume has a third dimension: depth.
Because volume has three dimensions: A line has one dimension: length An area has two dimensions: length and width Volume has three dimensions: length, width and depth.