Question

What is the SI unit of mass?

Hint:

Think of the unit written as kg.

Answer 1

Step 1. Recall that the International System of Units, or SI, fixes one standard unit for each basic physical quantity.
Step 2. Mass is one of the seven base quantities in this system, along with length, time, electric current, temperature, amount of substance and luminous intensity.
Step 3. The SI base unit chosen for mass is the kilogram, with the symbol kg.
Step 4. Since 2019 the kilogram is defined using a fixed numerical value of the Planck constant, rather than a physical metal block, but its size still corresponds to the mass most people know as one kilogram.
Answer. The SI unit of mass is the kilogram (kg).