Write some practical units of mass and time
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The SI base units of length, mass, and time are the meter (m), kilogram (kg), and second (s), respectively. SI units are a metric system of units, meaning values can be calculated by factors of 10. Metric prefixes may be used with metric units to scale the base units to sizes appropriate for almost any application.
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1.2 Dimensions, units, and physical quantities
QuantityDimensionSI unit
Mass = M = kilogram
Time = T= second
Electric = currentampere
Temperature= K = kelvin
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