A magnitude is a pure number - with no SI unit.
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A second is a SI base unit.
Yes, it is part of the SI. It is a derived unit.Yes, it is part of the SI. It is a derived unit.Yes, it is part of the SI. It is a derived unit.Yes, it is part of the SI. It is a derived unit.
The SI unit of measurement for temperature is the kelvin(K). Celsius is not an SI unit (it is a metric unit), but may be used alongside it.
That's what "unit" means.
The kg (kilogram) is the unit of mass in SI.The kg (kilogram) is the unit of mass in SI.The kg (kilogram) is the unit of mass in SI.The kg (kilogram) is the unit of mass in SI.