cubic centimetres, litres, cubic metres.
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The most common units used to express the volume of gas are liters (L) and cubic meters (m³). Other units such as milliliters (mL) and cubic centimeters (cm³) are also used for smaller volumes.
Cubic meter; cubic kilometer; liter (= cubic decimeter), milliliter (= cubic centimeter), cubic millimeter...
Length in metric units is usually in meters, centimeters, millimeters, and kilometers but there are other possible metric units of length. Volume in metric units is usually in liters, cubic centimeters or cubic meters but there are other possible metric units of volume. Mass in metric units is usually in kilograms, grams, or metric tons - although there are other possible metric units of mass.
Liters and MilliLiters
A pipe has the shape of a cylinder; just use the formula for the volume of a cylinder. In metric units, you have the advantage that the units are consistent. For example, if the radius and height of the cylinder are measured in decimeters, the volume will be in cubic decimeters (= liters).