Metric cavity (abbreviation l) for the volume unit decimetric cube. One litre of pure water has a volume of 1 dm³ or 1,000 cm³ and weighs exactly one kilogram (kg) at a temperature of 3.98 °C and at an air pressure of one atmosphere = 1013.25 hPa (hectopascal). The nominal volume on bottles is indicated in litres or parts thereof. Wine production volumes are usually expressed in hectolitres (100 litres), or in cases of 12 bottles. See also under hollow measures and units of measurement.