The main characteristic is that every SI unit is a member of a family of units which are related to each other by powers of ten.
A lesser characteristic is that many of the derived SI units are linked to one another so that there are simple conversions across different measures. For example:
1 kilogram*1 metres/second2 = 1 Newton
1 Newton*1 metre = 1 Joule
1 Watt = 1 Joule/1 second
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A magnitude is a pure number - with no SI unit.
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.
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.