# Litre FAQs:

Q: Is a litre derived from an older French unit?

A: Yes, and the litron, whose name came from Greek — where it was a unit of weight, not volume — via Latin, and which equalled approximately 0.831 litres.

Q: Are litres rarely?

A: Yes, if ever, used.

Q: Are litres commonly used for measuring water consumption?

A: Yes, and reservoir capacities and river flows, for larger volumes of fluids, such as annual consumption of tap water, lorry tanks, or swimming pools, the cubic metre is the general unit.

Q: Was a litre redefined as the space occupied by 1 kg of pure water at the temperature of its maximum density under a pressure of 1 atm?

A: Yes.

Q: Is a litre often also used in some calculated measurements?

A: Yes, such as density , allowing an easy comparison with the density of water.

Q: Is a litre the volume of a cube with sides of 10 cm, which is slightly less than a cube of sides 4 inches?

A: Yes, One cubic foot would contain exactly 27 such cubes , making one cubic foot approximately equal to 27 litres.

Q: Was a litre defined as the volume of one kilogram of pure water at maximum density and standard pressure?

A: Yes.

Q: Is a litre sometimes abbreviated as mcL on test results?

A: Yes.

Q: Was a litre also used in several subsequent versions of the metric system and is accepted for use with the SI, although not an official SI unit — the SI unit of volume is the cubic metre?

A: Yes, The spelling used by the International Bureau of Weights and Measures is "litre", a spelling which is shared by almost all English-speaking countries.

Q: Are litres most commonly used for items?

A: Yes, and which are measured by the capacity or size of their container, whereas cubic metres are most commonly used for items measured either by their dimensions or their displacements.

Q: Is a litre equal in volume to the millistere?

A: Yes, and an obsolete non-SI metric unit customarily used for dry measure.

Q: Was a litre once again defined in exact relation to the metre?

A: Yes, as another name for the cubic decimetre, that is, exactly 1 dm3.

Q: Is a litre not an official SI unit?

A: Yes, and it is accepted by the CGPM for use with the SI.

Q: Was a litre introduced in France in 1795 as one of the new "republican units of measurement" and defined as one cubic decimetre?

A: Yes.

A: Yes, standards are shown at the Musée des Arts et Métiers in Paris.

Q: Are litres often written in full?

A: Yes, In 1990, the CIPM stated that it was still too early to choose a single symbol for the litre.

Q: Is a litre the typical unit for production and export volumes of beverages and for measuring the size of the catch and quotas for fishing boats?

A: Yes, decilitres are common in Switzerland and Scandinavia and sometimes found in cookbooks; centilitres indicate the capacity of drinking glasses and of small bottles.

Q: Was a litre l?

A: Yes, and following the SI convention that only those unit symbols that abbreviate the name of a person start with a capital letter.

Q: Was a litre about 1.000028 dm3?

A: Yes.

Q: Is a litre slightly more than one U.S?

A: Yes, liquid quart and slightly less than one imperial quart or one U.S. dry quart.