Sivaram Arabandi This is a subset of the measurement units needed for the Sleep Domain Ontology. 1.0 unit:Non-SI_unit Certain units that are not part of the International System of Units, i.e., they are outside the SI, but are important and widely used. [http://physics.nist.gov/cuu/Units/outside.html] Non-SI unit unit:SI_system modern form of the metric system and is generally a system devised around the convenience of the number ten. [http://en.wikipedia.org/wiki/International_System_of_Units] SI system (le Système international d'unités) unit:US_length_unit The system for measuring length in the United States customary system is based on the inch, foot, yard, and mile, which are the only four customary length measurements in everyday use. Since July 1, 1959, these have been defined on the basis of 1 yard = 0.9144 meters except for some applications in surveying. [http://en.wikipedia.org/wiki/United_States_customary_units#Units_of_length] US length unit unit:US_mass_unit There have historically been five different English systems of mass: tower, apothecaries', troy, avoirdupois, and metric. Of these, it is the avoirdupois system which is the most common system of weights in the U.S., although Troy weight is still used to weigh precious metals. The avoirdupois (pronounced /ˌævərdəˈpɔɪz/; French pronunciation: [avwaʀdypwɑ]) system is a system of weights (or, properly, mass) based on a pound of sixteen ounces. [http://en.wikipedia.org/wiki/United_States_customary_units#Units_of_mass] US mass unit unit:US_ounce (unit:gram / 28.34952) ounce (oz) unit:US_pound (unit:US_ounce / 16) (unit:gram / 453.59237) pound (lb) unit:area_density_unit http://purl.org/obo/owl/UO#UO_0000054 Definition: A density unit which is a standard measure of the mass exerting an influence on a given area. [Wikipedia] area density unit mass per unit area unit unit:base_unit http://purl.org/obo/owl/UO#UO_0000045 Definition: A unit which is one of a particular measure to which all measures of that type can be related. [NIST] base unit unit:centimeter (unit:meter * 100) http://purl.org/obo/owl/UO#UO_0000015 Definition: A length unit which is equal to one hundredth of a meter or 10^[-2] m. [NIST] centimeter cm unit:count http://purl.org/obo/owl/UO#UO_0000189 Definition: A dimensionless unit which denotes a simple count of things. [MGED] count score tally unit:cubic_meter (unit:liter / 1000) http://purl.org/obo/owl/UO#UO_0000096 Definition: A volume unit which is equal to the volume of a cube with edges one meter in length. One cubic meter equals to 1000 liter.s [NIST] cubic meter m^[3] unit:day (unit:hour / 24) http://purl.org/obo/owl/UO#UO_0000033 Definition: A time unit which is equal to 24 hours. [Wikipedia] day unit:decibel http://purl.org/obo/owl/UO#UO_0000259 Definition: The decibel (dB) is a logarithmic unit of measurement that expresses the magnitude of a physical quantity (usually power or intensity) relative to a specified or implied reference level. Since it expresses a ratio of two quantities with the same unit, it is a dimensionless unit. A decibel is one tenth of a bel, a seldom-used unit. [Wikipedia] An ratio unit which is an indicator of sound power per unit area. [techtarget] decibel dB unit:density_unit http://purl.org/obo/owl/UO#UO_0000182 Definition: A derived unit which is a standard measure of the influence exerted by some mass. [Wikipedia] density unit unit:derived_unit http://purl.org/obo/owl/UO#UO_0000046 Definition: A unit which is derived from base units. [Wikipedia] derived unit unit:dimensionless_unit http://purl.org/obo/owl/UO#UO_0000186 Definition: A derived unit which is a standard measure of physical quantity consisting of only a numerical number without any units. [Wikipedia] dimensionless unit unit:english_system refers to the historical units of measurement in medieval England, which evolved as a combination of the Anglo-Saxon and Roman systems of units. [http://en.wikipedia.org/wiki/English_unit] types of English system: Imperial system: is a system of units, first defined in the British Weights and Measures Act of 1824, later refined (until 1959) and reduced. [http://en.wikipedia.org/wiki/Imperial_unit] United States customary units: most commonly used system of measurement in the United States. It is similar but not identical to the British Imperial units. The vast majority of U.S. customary units have been defined in terms of the meter and the kilogram since the Mendenhall Order of 1893 (and, in practice, for many years before that date). [http://en.wikipedia.org/wiki/United_States_customary_units] English system of measurement unit:event_count Definition: A dimensionless count unit which denotes the number of occurrences of an event. event count number of events unit:event_frequency Definition: the number of occurrences of an event within a fixed time interval. [Wikipedia] Event frequency unit:events_per_day (unit:events_per_hour * 24) Definition: number of events occurring in 1 day. Events per day unit:events_per_hour (unit:events_per_minute * 60) Definition: number of events occurring in 1 hour. Events per hour unit:events_per_minute (unit:events_per_second * 60) Definition: number of events occurring in 1 minute. Events per minute unit:events_per_month (unit:events_per_day * 30) Definition: number of events occurring in 1 month. Events per month unit:events_per_second Definition: number of events occurring in 1 second. Events per second unit:events_per_week (unit:events_per_day * 7) Definition: number of events occurring in 1 week. Events per week unit:events_per_year (unit:events_per_day * 365.25) Definition: number of events occurring in 1 year. Events per year unit:foot (unit:inch / 12) (unit:meter / 0.3048) foot (ft) unit:fraction http://purl.org/obo/owl/UO#UO_0000191 Definition: A dimensionless ratio unit which relates the part (the numerator) to the whole (the denominator). [Wikipedia] fraction unit:frequency_unit http://purl.org/obo/owl/UO#UO_0000105 Definition: A derived unit which is a standard measure of the number of repetitive actions in a particular time. [NIST] frequency unit unit:gram (unit:kilogram * 1000) http://purl.org/obo/owl/UO#UO_0000021 Definition: A mass unit which is equal to one thousandth of a kilogram or 10^[-3] kg. [NIST] gram g unit:hertz http://purl.org/obo/owl/UO#UO_0000106 Definition: A frequency unit which is equal to 1 complete cycle of a recurring phenomenon in 1 second. [NIST] hertz Hz unit:hour (unit:minute / 60) http://purl.org/obo/owl/UO#UO_0000032 Definition: A time unit which is equal to 3600 seconds or 60 minutes. [Wikipedia] hour h unit:inch (unit:millimeter / 25.4) inch (in) unit:kilogram_per_square_meter http://purl.org/obo/owl/UO#UO_0000086 Definition: An area density unit which is equal to the mass of an object in kilograms divided by the surface area in meters squared. [NIST] kilogram per square meter kg/m^[2] unit:length_unit http://purl.org/obo/owl/UO#UO_0000001 Definition: A base unit which is a standard measure of the distance between two points. [Wikipedia] length unit unit:liter http://purl.org/obo/owl/UO#UO_0000099 Definition: A volume unit which is equal to one thousandth of a cubic meter or 10^[-3] m^[3], or to 1 decimeter. [NIST] liter L unit:liter_per_minute Definition: liter per minute l/m liter/min unit:mass_unit http://purl.org/obo/owl/UO#UO_0000002 Definition: A base unit which is a standard measure of the amount of matter/energy of a physical object. [Wikipedia] mass unit unit:meter http://purl.org/obo/owl/UO#UO_0000008 Definition: A length unit which is equal to the length of the path traveled by light in vacuum during a time interval of 1/299 792 458 of a second. [NIST] meter m unit:metric_system an international decimalised system of measurement. [http://en.wikipedia.org/wiki/Metric_system] Metric system of measurement unit:mile (unit:meter / 1609.344) (unit:yard / 1760) mile (mi) unit:milligram (unit:gram * 1000) http://purl.org/obo/owl/UO#UO_0000022 Definition: A mass unit which is equal to one thousandth of a gram or 10^[-3] g. [NIST] milligram mg unit:millimeter (unit:meter * 1000) http://purl.org/obo/owl/UO#UO_0000016 Definition: A length unit which is equal to one thousandth of a meter or 10^[-3] m. [NIST] millimeter mm unit:millimeters_of_mercury Pressure exerted by a column of mercury. One mmHg (millimeter of mercury) is equal to one torr (133.322 Pa). millimeters of mercury mm Hg Millimeters of Mercury unit:minute (unit:second / 60) http://purl.org/obo/owl/UO#UO_0000031 Definition: A time unit which is equal to 60 seconds. [Wikipedia] minute min unit:month (unit:day / 30) http://purl.org/obo/owl/UO#UO_0000035 Definition: A time unit which is approximately equal to the length of time of one of cycle of the moon's phases which is science is taken to be equal to 30 days. [Wikipedia] month unit:named_ratio grouping for some special types of ratios unit:non-SI_pressure_unit Pressure units that are not part of the SI system but are widely used. non-SI pressure unit unit:pascal http://purl.org/obo/owl/UO#UO_0000110 Definition: A pressure unit which is equal to the pressure or stress on a surface caused by a force of 1 newton spread over a surface of 1 m^[2]. pascal Pa unit:percent (unit:fraction * 100) http://purl.org/obo/owl/UO#UO_0000187 Definition: A dimensionless ratio unit which denotes numbers as fractions of 100. [Wikipedia] percent % unit:pressure_unit http://purl.org/obo/owl/UO#UO_0000109 Definition: A derived unit which is a standard measure of the force applied to a given area. pressure unit unit:ratio http://purl.org/obo/owl/UO#UO_0000190 Definition: A dimensionless unit which denotes an amount or magnitude of one quantity relative to another. [Wikipedia] ratio unit:scale Definition: A dimensionless ratio unit which relates the part (the numerator) to a specified, fixed whole (the denominator). E.g. in a map, a scale of 1:10,000 may mean something like 1 centimeter on the map is equivalent to 100 meters on the ground. scale unit:second http://purl.org/obo/owl/UO#UO_0000010 Definition: A time unit which is equal to the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the caesium 133 atom. [NIST] second s unit:time_unit http://purl.org/obo/owl/UO#UO_0000003 Definition: A base unit which is a standard measure of the dimension in which events occur in sequence. [Wikipedia] time unit unit:unit http://purl.org/obo/owl/UO#UO_0000000 Definition: A unit of measurement is a standardized quantity of a physical quality. [Wikipedia] Unit of measurement unit:united_states_customary_units most commonly used system of measurement in the United States. It is similar but not identical to the British Imperial units. The vast majority of U.S. customary units have been defined in terms of the meter and the kilogram since the Mendenhall Order of 1893 (and, in practice, for many years before that date). [http://en.wikipedia.org/wiki/United_States_customary_units] United States customary units American system English units unit:volume_flow_unit Definition: the volume of fluid which passes through a given surface per unit time. [Wikipedia] volume flow unit unit:volume_unit http://purl.org/obo/owl/UO#UO_0000095 Definition: A derived unit which is a standard measure of the amount of space occupied by any substance, whether solid, liquid, or gas. [NIST] volume unit unit:week (unit:day / 7) http://purl.org/obo/owl/UO#UO_0000034 Definition: A time unit which is equal to 7 days. [Wikipedia] week unit:yard (unit:foot / 3) (unit:meter / 0.9144) yard (yd) unit:year (unit:day / 365.25) http://purl.org/obo/owl/UO#UO_0000036 Definition: A time unit which is equal to 12 months which is science is taken to be equal to 365.25 days. [Wikipedia] year owl:Thing 1.0 Sivaram Arabandi This is a subset of the measurement units needed for the Sleep Domain Ontology. 1.0 unit:kilogram http://purl.org/obo/owl/UO#UO_0000009 Definition: A mass unit which is equal to the mass of the International Prototype Kilogram kept by the BIPM at Svres, France. [NIST] kilogram kg