102,815
edits
Changes
Created page with 'File:lighterstill.jpgright|frame ==Etymology== [http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Midd...'
[[File:lighterstill.jpg]][[File:Birth_rate.jpg|right|frame]]
==Etymology==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Anglo-French, from Medieval Latin rata, from [[Latin]] (pro) rata (parte) according to a fixed [[proportion]]
Date: [http://www.wikipedia.org/wiki/15th_Century 15th century]
==Definitions==
*1 a : reckoned [[value]] : valuation
:b obsolete : estimation
*2 obsolete : a fixed [[quantity]]
*3 a : a fixed [[ratio]] between [[two]] [[things]]
:b : a charge, payment, or price fixed according to a [[ratio]], scale, or [[standard]]: as (1) : a charge per [[unit]] of a [[public]]-[[service]] commodity (2) : a charge per unit of freight or passenger service (3) : a unit charge or [[ratio]] used in assessing property taxes (4) British : a local tax
*4 a : a [[quantity]], amount, or [[degree]] of something measured per [[unit]] of something else <her typing rate was 80 words per minute>
:b : an amount of payment or charge based on another amount; specifically : the amount of premium per unit of insurance
*5 : ''relative'' condition or [[quality]] : class
==Description==
In [[mathematics]], a '''rate''' is a [[ratio]] between two [[measurements]], often with [[different]] [[units]]. If the unit or [[quantity]] in respect of which something is changing is not specified, usually the rate is per [[unit]] time. However, a rate of [[change]] can be specified per unit time, or per unit of length or [[mass]] or another [[quantity]]. The most common type of rate is "per unit time", such as [[speed]], [[heart]] rate and flux. Rates that have a non-time denominator include exchange rates, literacy rates and electric flux.
In describing the units of a rate, the word "per" is used to separate the [[units]] of the two [[measurements]] used to calculate the rate (for example a heart rate is [[expressed]] "beats per minute"). A rate defined using two [[numbers]] of the same units (such as tax rates) or counts (such as literacy rate) will result in a dimensionless [[quantity]], which can be expressed as a percentage (for example, the global literacy rate in 1998 was 80%) or [[fraction]] or as a multiple.
Often "rate" is a synonym of [[rhythm]] or [[frequency]], a count per second (i.e. Hertz) e.g. radio frequencies or heart rate or sample rate.[http://en.wikipedia.org/wiki/Rate_%28mathematics%29]
[[Category: Mathematics]]
==Etymology==
[http://nordan.daynal.org/wiki/index.php?title=English#ca._1100-1500_.09THE_MIDDLE_ENGLISH_PERIOD Middle English], from Anglo-French, from Medieval Latin rata, from [[Latin]] (pro) rata (parte) according to a fixed [[proportion]]
Date: [http://www.wikipedia.org/wiki/15th_Century 15th century]
==Definitions==
*1 a : reckoned [[value]] : valuation
:b obsolete : estimation
*2 obsolete : a fixed [[quantity]]
*3 a : a fixed [[ratio]] between [[two]] [[things]]
:b : a charge, payment, or price fixed according to a [[ratio]], scale, or [[standard]]: as (1) : a charge per [[unit]] of a [[public]]-[[service]] commodity (2) : a charge per unit of freight or passenger service (3) : a unit charge or [[ratio]] used in assessing property taxes (4) British : a local tax
*4 a : a [[quantity]], amount, or [[degree]] of something measured per [[unit]] of something else <her typing rate was 80 words per minute>
:b : an amount of payment or charge based on another amount; specifically : the amount of premium per unit of insurance
*5 : ''relative'' condition or [[quality]] : class
==Description==
In [[mathematics]], a '''rate''' is a [[ratio]] between two [[measurements]], often with [[different]] [[units]]. If the unit or [[quantity]] in respect of which something is changing is not specified, usually the rate is per [[unit]] time. However, a rate of [[change]] can be specified per unit time, or per unit of length or [[mass]] or another [[quantity]]. The most common type of rate is "per unit time", such as [[speed]], [[heart]] rate and flux. Rates that have a non-time denominator include exchange rates, literacy rates and electric flux.
In describing the units of a rate, the word "per" is used to separate the [[units]] of the two [[measurements]] used to calculate the rate (for example a heart rate is [[expressed]] "beats per minute"). A rate defined using two [[numbers]] of the same units (such as tax rates) or counts (such as literacy rate) will result in a dimensionless [[quantity]], which can be expressed as a percentage (for example, the global literacy rate in 1998 was 80%) or [[fraction]] or as a multiple.
Often "rate" is a synonym of [[rhythm]] or [[frequency]], a count per second (i.e. Hertz) e.g. radio frequencies or heart rate or sample rate.[http://en.wikipedia.org/wiki/Rate_%28mathematics%29]
[[Category: Mathematics]]