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===Meaning===
[[File:Ruler30cmDiagonal.png|right|300px|thumb|A 30cm ruler.]]
A '''Ruler''' is a piece of '''[[equipment''' ]] we can use to [[measure]] how long something is.
: Singular [[Noun]]: '''Ruler'''
===About Rulers===
: There are many different kinds of '''rulers ''' but they all do the same job. : There are metre '''rulers ''' which can measure as long as 1 meter metre and as small as 1 millimetermillimetre. : There are 'foot' ''' rulers ''' which can measure as long as 30 centimetres and as short as 1 millimetre. : Some '''rulers ''' are made of wood and some '''rulers ''' are made of plastic.
===Examples===
: The [[height]] of the [[Scientist|scientist's]] friends was found using a '''ruler'''.
: The [[Scientist|scientist's]] '''ruler''' was too short to [[measure]] the [[distance]] form the office to the [[laboratory]]
===Note for Teachers===
: You may wish to avoid referring to a 30cm ruler as a foot ruler. 30cm is not exactly 1 foot, since 1 foot is 12 inches and there are 2.54 cm in 1 inch. This makes a foot 30.48cm.
==Key Stage 2==
===Meaning===
A '''ruler''' is a piece of [[equipment]] used to [[measure]] the [[distance]] between two points.===About Rulers===: [[Ruler]]s can be used to [[measure]] the [[length]], [[width]] and [[height]] of [[object]]s.: Metre '''rulers''' can [[measure]] as long as 1 [[metre]] and as small as 1 millimetre.: There are 'foot' '''rulers''' can [[measure]] as long as 30 centimetres and as short as 1 millimetre.: Some '''rulers''' are made of [[wood]] and some '''rulers''' are made of [[Plastic (Material)|plastic]]. ==Key Stage 3=====Meaning===A [[ruler]] is a [[Measuring Instrument|measuring instrument]] used to [[measure]] the [[distance]] between two points. ===About Rulers===: [[Ruler]]s can be used to [[measure]] the [[length]], [[width]] and [[height]] of [[object]]s.: [[Ruler]]s used in the lab are usually divided into [[centimetre]]s and [[millimetre]]s.: Metre '''rulers''' can [[measure]] as long as 1 [[metre]] and as small as 1 [[millimetre]].: There are 'foot' '''rulers''' can [[measure]] as long as 30 [[centimetre]]s and as short as 1 [[millimetre]].: Some '''rulers''' are made of [[wood]] and some '''rulers''' are made of [[Plastic (Material)|plastic]]. ==Key Stage 4=====Meaning===A [[ruler]] is a [[Scientific Measuring Instrument|measuring instrument]] used to [[measure ]] the [[distance ]] between objects or two points. ===About Rulers===: [[Ruler]]s can be used to [[measure]] the lenght[[length]], [[width ]] and [[height ]] of an [[object]]s.: [[Ruler]]s used in the lab are usually divided into [[centimetre]]s and [[millimetre]]s.: Most [[ruler]]s have a [[resolution]] of 1 [[millimetre]] because that is the smallest the [[human]] [[eye]] can correctly [[reading|read]].: To use a [[ruler]] [[accurate]]ly the [[reading]] from each end should be checked before subtracting one from the other to find the [[distance]]. ===References=======OCR==== :[https://www.amazon.co.uk/gp/product/1782945695/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=1782945695&linkCode=as2&tag=nrjc-21&linkId=ceafcc80bcad6b6754ee97a0c7ceea53 ''Rulers, page 219, Gateway GCSE Combined Science; The Revision Guide, CGP, OCR '']