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A millimetre (American spelling: millimeter, symbol mm) is one thousandth of a metre, which is the International System of Units (SI) base unit of length.The millimetre is part of a metric system. A corresponding unit of area is the square millimetre and a corresponding unit of volume is the cubic millimetre. millimetre (American spelling: millimeter, symbol mm) is one thousandth of a metre, which is the International System of Units (SI) base unit of length.
So, Unit of Measurement of volume is defined as the cubic metre (symbol: m3), or in terms of some other unit of length derived from the metre. Examples: Since, 1 m = 100 cm. Therefore: 1 m3 = 1,000,000 cm3, (AKA: cc or ccm, ml, mL or millilitre). Since, 1 m = 1,000 mm.