SI Units SI units are the Système Internationale units created in 1960 and used by nearly all...
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Transcript of SI Units SI units are the Système Internationale units created in 1960 and used by nearly all...
![Page 1: SI Units SI units are the Système Internationale units created in 1960 and used by nearly all countries in the world as a standard. SI has seven base units:](https://reader036.fdocuments.us/reader036/viewer/2022072007/56649d365503460f94a0df80/html5/thumbnails/1.jpg)
SI Units• SI units are the Système Internationale units created in 1960
and used by nearly all countries in the world as a standard. SI has seven base units:• meter for length• kilogram for mass (note: not the gram)• second for time• Ampere for electric current• Kelvin for temperature• Candela for luminous intensity• mole for the amount of substance
SI units are written in lowercase.
![Page 2: SI Units SI units are the Système Internationale units created in 1960 and used by nearly all countries in the world as a standard. SI has seven base units:](https://reader036.fdocuments.us/reader036/viewer/2022072007/56649d365503460f94a0df80/html5/thumbnails/2.jpg)
SI Units
• The base units measure dimensions. (Remember dimensions are physical quantities, a unit is a
measurement of a dimension)
Derived units are formed by combining the seven base units by multiplying or dividing.(ex: speed = distance/time)
![Page 3: SI Units SI units are the Système Internationale units created in 1960 and used by nearly all countries in the world as a standard. SI has seven base units:](https://reader036.fdocuments.us/reader036/viewer/2022072007/56649d365503460f94a0df80/html5/thumbnails/3.jpg)
SI Units
• SI uses prefixes to denote quantities smaller or larger than the base unit. Ex: centimeter
Power Prefix Abbreviation Power Prefix Abbreviation
10-18 atto- a 101 deka- da
10-15 femto- f 102 hecta- h
10-12 pico- P 103 kilo- k
10-9 nano- n 106 mega- M
10-6 micro- µ (mu) 109 giga- G
10-3 milli- m 1012 tera- T
10-2 centi- c 1015 peta- P
10-1 deci- d 1018 exa- E
![Page 4: SI Units SI units are the Système Internationale units created in 1960 and used by nearly all countries in the world as a standard. SI has seven base units:](https://reader036.fdocuments.us/reader036/viewer/2022072007/56649d365503460f94a0df80/html5/thumbnails/4.jpg)
SI Units• To convert measurements between prefixes, use
dimensional analysis (a form of ratios) with the quantity you want in the numerator.
Ex1: Write 2.56 m as mm.Ex2: Write 4.5 mm as km.Ex3: Write 0.567 m as nm.Ex4: A human hair is approximately 50 µm in diameter. Express this in meters.