Second is a part of SI BUT is not related to METRE - and hence the Metric System.
Brij, how can you say that the second is not part of the metric system? You say the second is part of SI, don't you? Well, SI is the metric system.
Yes, I know there are older forms of the metric systems and other variations, but when we speak of the metric system we are USUALLY referring to the SI version of the metric system. (That is even written into law in the US. There are US laws that specify that when the term "metric system" is used in law it shall mean the SI metric system.)
So the second is without a doubt part of the metric system, the SI version of that system.
(What this has to do with Brij's comment phrase about second not being "related" to the metre I fail to understand.Of course they're not related. They are not supposed to be.
The second and the metre are two independent measuring units of the seven required. It can be shown that no more than seven are needed to form combinations that will measure ANY physical quantity. The second and the metre are two of the seven chosen as base units in SI. The other five are the kilogram, the kelvin, the ampere, the mole and the candela).
Regards,
Bill Hooper
Fernandina Beach, Florida, USA
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Go Metric, America !
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