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Volume:
Volume is the measure of the amount of space occupied by a three-dimensional substance. It is expressed in cubic units.
Volume of a cuboid:

Let $$l$$ units, $$b$$ units and $$h$$ units be the length, breadth and height of the cuboid respectively.

Then, volume $$=$$ $$\text{length} \times \text{breadth} \times \text{height}$$ cu. units

Volume $$=$$ $$\text{base area} \times \text{height}$$ cu. units

Volume of a cuboid $$=$$ $$lbh$$ cu. units.
Example:
Calculate the volume of the cuboid of length $$6 \ cm$$, breadth $$5 \ cm$$ and height $$3 \ cm$$.

Solution:

Length of the cuboid $$=$$ $$6 \ cm$$

Breadth of the cuboid $$=$$ $$5 \ cm$$

Height of the cuboid $$=$$ $$3 \ cm$$

Volume of the cuboid $$=$$ $$lbh$$ cu. units

$$=$$ $$6 \times 5 \times 3$$

$$=$$ $$90$$ $$cm^3$$

Therefore, the volume of the cuboid is $$90$$ $$cm^3$$.
Important!
The units of length, breadth and height should be the same while calculating the surface area of the cuboid.