Volume is the measure of the amount of space that a substance or object occupies. It is a scalar quantity, meaning it has magnitude but no direction.

The units of volume depend on the system of measurement used:

• SI (International System of Units): The standard unit of volume is the cubic meter (m³). Other common units include liters (L), milliliters (mL), and cubic centimeters (cm³). 1 L = 1000 cm³ = 0.001 m³
• Imperial and US Customary Units: Common units include cubic inches (in³), cubic feet (ft³), fluid ounces (fl oz), pints (pt), quarts (qt), and gallons (gal).

Volume is commonly calculated using mathematical formulas specific to the shape of the object, or it can be measured directly using instruments like graduated cylinders or measuring cups.