imperial and si units

7/27/2019 Imperial and SI Units

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Muhammad Bin Basar IPTIJB 1

History of

Measurements The British Imperial System

The Metric System


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The British Imperial System The Imperial units or the Imperial system is

a collection of units, first defined in the Weightsand Measures Act of 1824, later refined (until1959) and reduced.

The units were introduced in the UnitedKingdom and its colonies, includingCommonwealth countries (though mostCommonwealth countries are officially metric),

but excluding the then already independentUnited States.

Systems of Imperial units are sometimesreferred to as foot-pound-second, after thebase units of length, mass and time.
http://en.wikipedia.org/wiki/System_of_unitshttp://en.wikipedia.org/wiki/United_Kingdomhttp://en.wikipedia.org/wiki/United_Kingdomhttp://en.wikipedia.org/wiki/Commonwealth_of_Nationshttp://en.wikipedia.org/wiki/Commonwealth_of_Nationshttp://en.wikipedia.org/wiki/United_Kingdomhttp://en.wikipedia.org/wiki/United_Kingdomhttp://en.wikipedia.org/wiki/System_of_units


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The Metric System

Metrication ormetrification refers to the

introduction of the SI metric system as the

international standard for physical

measurementsa long-term series of

independent and systematic conversions

from the various separate local systems of

weights and measures.
http://en.wikipedia.org/wiki/Metric_systemhttp://en.wikipedia.org/wiki/International_standardhttp://en.wikipedia.org/wiki/Localismhttp://en.wikipedia.org/wiki/Historical_weights_and_measureshttp://en.wikipedia.org/wiki/Historical_weights_and_measureshttp://en.wikipedia.org/wiki/Localismhttp://en.wikipedia.org/wiki/International_standardhttp://en.wikipedia.org/wiki/Metric_system


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The British Imperial System

Measure of Length: Thou, inch, foot,yard, fur long, mi le, league

Maritime units:fathom, cable,naut ical m i le

Measures of area : rood, acre

Measures of volume : f lu id ounce (f l oz),g i l lpin t (p t), quart (q t), gallon (gal)

Measures of weight and mass : grain,d rachm , ounce (oz), pound (lb), stone (st) ,

quarterhund redweight (cw t), ton (t)
http://en.wikipedia.org/wiki/Thou_(unit_of_length)http://en.wikipedia.org/wiki/Inchhttp://en.wikipedia.org/wiki/Foot_(unit_of_length)http://en.wikipedia.org/wiki/Yardhttp://en.wikipedia.org/wiki/Furlonghttp://en.wikipedia.org/wiki/Milehttp://en.wikipedia.org/wiki/League_(unit)http://en.wikipedia.org/wiki/Fathomhttp://en.wikipedia.org/wiki/Cable_lengthhttp://en.wikipedia.org/wiki/Nautical_milehttp://en.wikipedia.org/wiki/Roodhttp://en.wikipedia.org/wiki/Acrehttp://en.wikipedia.org/wiki/Acrehttp://en.wikipedia.org/wiki/Roodhttp://en.wikipedia.org/wiki/Nautical_milehttp://en.wikipedia.org/wiki/Cable_lengthhttp://en.wikipedia.org/wiki/Fathomhttp://en.wikipedia.org/wiki/League_(unit)http://en.wikipedia.org/wiki/Milehttp://en.wikipedia.org/wiki/Furlonghttp://en.wikipedia.org/wiki/Yardhttp://en.wikipedia.org/wiki/Foot_(unit_of_length)http://en.wikipedia.org/wiki/Inchhttp://en.wikipedia.org/wiki/Thou_(unit_of_length)


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The Metric System Metrication began in France in the 1790s and

spread during the following two centuries toencompass all but three countries with 95% ofthe world's population

The desire for a single international system of

measurement derives from growinginternational trade and the need to applycommon standards to goods. For a company to

buy a product produced in another country, theyneed to ensure that the product will arrive asdescribed

revolutionary France was to produce the

definitive International System of Units
http://en.wikipedia.org/wiki/International_System_of_Unitshttp://en.wikipedia.org/wiki/1790shttp://en.wikipedia.org/wiki/International_standardhttp://en.wikipedia.org/wiki/Revolutionary_Francehttp://en.wikipedia.org/wiki/International_System_of_Unitshttp://en.wikipedia.org/wiki/International_System_of_Unitshttp://en.wikipedia.org/wiki/Revolutionary_Francehttp://en.wikipedia.org/wiki/International_standardhttp://en.wikipedia.org/wiki/1790s


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International System of Units (SI)

The first official adoption of such a system was after

the French Revolution of 1789 The creators of the metric system tried to choose units

that were non-arbitrary and practical

The original system started with the metre as the unit

ofdistance, the gram as the unit ofmass, and thesecondas the unit of time

Derived units are made from logical combinations ofbase units. For example, the speed of an object is

defined by the number of metres it moves everysecond m/s.

The current version of this system was agreed upon in1971 and is organised and maintained by the

International Bureau of Weights and Measures
http://en.wikipedia.org/wiki/International_Bureau_of_Weights_and_Measureshttp://en.wikipedia.org/wiki/French_Revolutionhttp://en.wikipedia.org/wiki/Metric_systemhttp://en.wikipedia.org/wiki/Distancehttp://en.wikipedia.org/wiki/Masshttp://en.wikipedia.org/wiki/Speedhttp://en.wikipedia.org/wiki/International_Bureau_of_Weights_and_Measureshttp://en.wikipedia.org/wiki/International_Bureau_of_Weights_and_Measureshttp://en.wikipedia.org/wiki/Speedhttp://en.wikipedia.org/wiki/Masshttp://en.wikipedia.org/wiki/Distancehttp://en.wikipedia.org/wiki/Metric_systemhttp://en.wikipedia.org/wiki/French_Revolution

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