The surface area of any given object is the area or region occupied by the surface of the object. At the same time, the volume is the amount of space available in an object. In geometry, there are different shapes and sizes, such as a sphere, cube, cuboid, cone, cylinder, etc. Each shape has its surface area as well as volume. Volume is the amount of space a container or object occupies. Capacity is the amount of water required to fill the fish tank (ml or L). Example. Volume is the space the tank and water take up.
Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains. Volume is often quantified numerically using the SI derived unit, the cubic metre.
Capacity is the measure of an object's ability to hold a substance, like a solid, a liquid or a gas. It can be measured in almost every other unit, including litres, gallons, pounds, etc.