The "metric system", which was adopted by 17 countries in 1875 by signing a treaty, is the basis for all hollow measures in use worldwide today (Table 1). In addition, very old hollow measures are still in use (Table 2). The Anglo-American measurement systems are almost only used in the USA, England and some other countries (Table 3). The old Roman hollow measures are included under Congius.
Only the USA, Myanmar and Liberia have not yet introduced the metric system, although it is used in practice by the latter two countries. One litre of water weighs exactly one kilogram (kg) and has a volume of 1 dm³ at a temperature of 3.98 °C and an air pressure of 1013.25 hPa (hectopascal).
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