The SI System Versus the Metric System
Most, but not all, SI units correspond to the metric units for the same quantities. Some notable exceptions are the following:
- The SI unit for mass is the kilogram, but the metric unit for mass is the gram.
- The SI unit for temperature is the Kelvin, but the metric unit for temperature is degrees Celsius.
Whenever we discuss a new quantity in this class, we will also discuss the appropriate SI unit(s) for that quantity.