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# SI Base Quantities and Units - PowerPoint PPT Presentation

SI Base Quantities and Units. Metric(SI) Prefixes. Chapter1:Length. 1m  10 -7 of the distance from the equator to the pole 1m = length of the path traveled by light in vacuum during the time interval of 1/299,792,458 of a second. Mass.

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## PowerPoint Slideshow about 'SI Base Quantities and Units' - dana

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Presentation Transcript

1m  10-7 of the distance from the equator to the pole

1m = length of the path traveled by light in vacuum during the time interval of 1/299,792,458 of a second

1kg = mass of the platinum-iridium cylinder in Paris

1u = 1.6605 10-27kg ( unified atomic mass unit)

1s = 1/24*60*60 day=1/86400 day

1s = time required for 9,192,631,720 periods of radiation of the Cs-atom

The 3 vectors Vi can be added by any order to form VR

VR= (V1+ V2)+V3

VR= V1+(V2+V3)

Components are projections along the axis

Find components by trigonometry

Scalar product

Vector product

of laser cooling

### Ion crystal

Fluorescence from stored ions for different degrees

of laser cooling