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48 SI Units? (page 48)

SI Units?

SI Units is the physical standard for units like with seconds for time and meters for distance.

   But within some areas other units are used. Speed limits are often either miles per hour or kilometers per hour. And not meters pr. seconds which is the SI Unit for speed.
   100 km/h ~ 28 m/s ~ 62 mph
   60 mph ~ 27 m/s ~ 97 km/h
   30 m/s ~ 108 km/h ~ 67 mph

Meter per seconds can be used because if you decide either miles per hour or kilometres pr. hour some people have to get used to a new unit for speed (limits).

When it comes to volume it becomes more difficult because the SI Unit is m³ and is 1000 times bigger than liters and 1000000 times bigger than milliliters which is used in cooking recepies.

"You take 0,0001m³1 dl milk and 0,000005m³1 tea spoon salt ..."

But liter is derived from the SI Unit m³ sor so it sho may be accepted as an unit. Or citizens must learn to use scientific notation (100x10-6m³ milk and 5x10-6m³ salt).2013-08-05

 

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