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Difference between revisions of "SI Unit"

(Created page with "==Key Stage 4== ===Meaning=== '''SI Units''' are the standard scientific units used by scientists around the world. ===About SI Units=== : '''SI''' stands for "Systè...")
 
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: '''SI''' [[unit]]s have been standardised around the world so that any [[experiment]] can be [[reproduce|reproduced]] and so that components in machines are interchangeable.
 
: '''SI''' [[unit]]s have been standardised around the world so that any [[experiment]] can be [[reproduce|reproduced]] and so that components in machines are interchangeable.
 
: The [[USA]] does not always use '''SI Units'''. As a result of the confusion over [[unit]]s a [[Space Probe|space probe]] once crashed on [[Mars]] because one team of [[scientist]]s was using [[inch]]es and the other team was using hundredths of [[metre]] ([[centimetre]]s).
 
: The [[USA]] does not always use '''SI Units'''. As a result of the confusion over [[unit]]s a [[Space Probe|space probe]] once crashed on [[Mars]] because one team of [[scientist]]s was using [[inch]]es and the other team was using hundredths of [[metre]] ([[centimetre]]s).
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The '''SI Units''' you should know are in the following table:
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 +
{| class="wikitable"
 +
|-
 +
|'''Measurement'''
 +
|'''SI Unit'''
 +
|-
 +
|Distance, Displacement, Wavelength
 +
|metres
 +
|-
 +
|Time
 +
|seconds
 +
|-
 +
|Temperature
 +
|degrees Celcius or Kelvin
 +
|-
 +
|Mass
 +
|kilograms
 +
|-
 +
|Area
 +
|metres squared
 +
|-
 +
|Volume
 +
|metres cubed
 +
|-
 +
|Force, Weight
 +
|Newtons
 +
|-
 +
|Speed and Velocity
 +
|metres per second
 +
|-
 +
|Density
 +
|kilograms per metre cubed
 +
|-
 +
|Angle
 +
|degrees
 +
|-
 +
|Acceleration
 +
|metres per second per second
 +
|-
 +
|Moment
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|Newton Metres
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|-
 +
|Energy, Work Done
 +
|Joules
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|-
 +
|Electrical Charge
 +
|Coulombs
 +
|-
 +
|Electrical Current
 +
|Amps
 +
|-
 +
|Potential Difference
 +
|Volts
 +
|-
 +
|Resistance
 +
|Ohms
 +
|-
 +
|Radioactivity
 +
|Becquerels
 +
|-
 +
|Radiation Dose
 +
|Ohms
 +
|-
 +
|Frequency
 +
|Hertz
 +
|-
 +
|Magnetic Field Density
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|Teslas
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|-
 +
|Moles
 +
|Mol
 +
|-
 +
|Concentration
 +
|Mol per decimeter cubed
 +
|-
 +
|Light intensity
 +
|Lux
 +
|}

Revision as of 14:09, 21 March 2019

Key Stage 4

Meaning

SI Units are the standard scientific units used by scientists around the world.

About SI Units

SI stands for "Système international".
SI units have been standardised around the world so that any experiment can be reproduced and so that components in machines are interchangeable.
The USA does not always use SI Units. As a result of the confusion over units a space probe once crashed on Mars because one team of scientists was using inches and the other team was using hundredths of metre (centimetres).

The SI Units you should know are in the following table:

Measurement SI Unit
Distance, Displacement, Wavelength metres
Time seconds
Temperature degrees Celcius or Kelvin
Mass kilograms
Area metres squared
Volume metres cubed
Force, Weight Newtons
Speed and Velocity metres per second
Density kilograms per metre cubed
Angle degrees
Acceleration metres per second per second
Moment Newton Metres
Energy, Work Done Joules
Electrical Charge Coulombs
Electrical Current Amps
Potential Difference Volts
Resistance Ohms
Radioactivity Becquerels
Radiation Dose Ohms
Frequency Hertz
Magnetic Field Density Teslas
Moles Mol
Concentration Mol per decimeter cubed
Light intensity Lux
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