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In most countries, it is customary to measure that in liters.
It is a customary unit.
A Customary Unit or non-SI unit is a measurement unit that is not part of the metric system. Customary units are mainly units of the Imperial system but they could be localised customary units - such as Gaj (for area) is South Asia.
centimetres
For a desk like one used in schools the best unit would be pounds. Good luck on your measuring!