* Mass: The basic unit of mass in the International System of Units (SI) is the kilogram (kg).

* Volume: The basic unit of volume in the SI is the cubic meter (m³) .

Important Note: While the kilogram and cubic meter are the *base* units, you'll often encounter smaller or larger units depending on the scale of what you're measuring. For example:

* Mass: grams (g), milligrams (mg), tonnes (t)

* Volume: liters (L), milliliters (mL), cubic centimeters (cm³)