Answer the following question: Information: - A fluid ounce (abbreviated fl oz, fl. oz. or oz. fl., old forms , fl , f, ) is a unit of volume (also called capacity) typically used for measuring liquids. It is equivalent to approximately 30 millilitres. Whilst various definitions have been used throughout history, two remain in common use: the imperial and the United States customary fluid ounce. An imperial fluid ounce is of an imperial pint, of an imperial gallon or approximately 28.4ml. A US fluid ounce is of a US fluid pint, of a US liquid gallon or approximately 29.6ml. The fluid ounce is distinct from the ounce, a unit of weight or mass, although they do have a historical relationship, and it is sometimes referred to simply as an "ounce" where context makes the meaning clear. - The gallon is a unit of measurement for liquid capacity in both the US customary units and the British imperial systems of measurement. Three significantly different sizes are in current use: the "imperial" gallon defined as litres, which is used in the United Kingdom, Canada, and some Caribbean nations; the "US" gallon defined as , which is used in the US and some Latin American and Caribbean countries; and the least-used "US dry" gallon defined as . - The pint (abbreviated as "pt" or "p") is a unit of volume or capacity in both the imperial and United States customary measurement systems. In both of those systems it is traditionally one-eighth of a gallon, Imperial or U.S., although measuring a different amount of liquid (an Imperial pint equals 568 millilitres, or 20 Imperial fluid ounces; a U.S. pint equals 473 millilitres, or 16 U.S. fluid ounces). The British pint is thus about 20% larger than the American pint (the two systems are not the same). Almost all other countries have standardized on the metric system. The size of what may be called a pint varies depending on local custom. - The metric system is an internationally agreed decimal system of measurement. It was originally based on the and the introduced by the French First Republic in 1799, but over the years the definitions of the metre and the kilogram have been refined, and the metric system has been extended to incorporate many more units. Although a number of variants of the metric system emerged in the late nineteenth and early twentieth centuries, the term is now often used as a synonym for "SI" or the "International System of Units"the official system of measurement in almost every country in the world. - The litre (international spelling) or liter (American spelling) (SI symbols L or l, commonly, but incorrectly, abbreviated as ltr) is an SI accepted metric system unit of volume equal to 1 cubic decimetre (dm), 1,000 cubic centimetres (cm) or 1/1,000 cubic metre. A cubic decimetre (or litre) occupies a volume of 101010 centimetres (see figure) and is thus equal to one-thousandth of a cubic metre. - Volume is the quantity of three-dimensional space enclosed by a closed surface, for example, the space that a substance (solid, liquid, gas, or plasma) or shape occupies or contains. Volume is often quantified numerically using the SI derived unit, the cubic metre. The volume of a container is generally understood to be the capacity of the container, i. e. the amount of fluid (gas or liquid) that the container could hold, rather than the amount of space the container itself displaces. - The gill ( pronounced i / dl / ) is a unit of measurement for volume equal to a quarter of a pint . It is no longer in common use , except in regard to the volume of alcoholic spirits measures . In imperial units In United States customary units In Great Britain , the standard single measure of spirits in a pub was 1 6 gill ( 23.7 ml ) in England , and 1 5 gill ( 28.4 ml ) in Scotland ; after metrication this was replaced by either 25 or 35 ml ( 0.176 - or 0.246 - gill ) measures ( landlords can choose which one to serve ) . The 1 4 gill was previously the most common measure in Scotland , and still remains as the standard measure in pubs in Ireland . In southern England , it is also called a noggin . In northern England , however , the large noggin is used , which is two gills . In some areas , a gill came to mean half a pint for both beer and milk . In Ireland , the standard spirit measure was historically 1 4 gill . In the Republic of Ireland , it still retains this value , though it is now legally specified in metric units as 35.5 ml. Given the information, choose the subject and object entities that have the relation of 'instance of'.
Answer:
gill , unit of volume