In many European countries the metric system IS the customary system!
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Capacity can be measured using both the metric system and customary units. In the metric system, capacity is typically measured in liters or milliliters, while in the customary system, it is measured in ounces, cups, pints, quarts, and gallons.
Only the U.S.A. uses the customary system. Myanmar(Burma) and Liberia both use the old UK Imperial system, which uses the same names for units as the customary, but assigns them different sizes. The whole of the rest of the world uses metric.
The unit of length, meters, belongs to both the US Customary System and the metric system.
The unit of mass, the kilogram, is a part of both the US customary system and the metric system. In the US customary system, pounds are used for mass measurement, while the metric system uses kilograms.
Units such as the meter, kilogram, liter, and Celsius are part of both the United States customary system and the metric system.