* Cubic inches (in³) measures volume: It tells you how much space something takes up.
* Ounces (oz) measures weight or mass: It tells you how heavy something is.
To convert between volume and weight, you need to know the density of the substance. Density is how much mass is packed into a given volume.
Here's an example:
* Water: 1 cubic inch of water weighs about 0.55 ounces.
* Gold: 1 cubic inch of gold weighs about 19.3 ounces (much denser than water).
So, to convert cubic inches to ounces, you need to know what material you're dealing with.