**1.2 Amount of Space Occupied by Matter** Lesson 1.2

**1.2 Amount of Space Occupied by Matter**

What units are used to express the amount of space occupied by matter?

**SI Units**

- Scientists use the
**International System of Units**to measure the properties of matter. - The system is abbreviated "SI", after its French name, Systeme International d'Unites.

- The SI unit for mass is the kilogram (kg). The gram (g) is the smaller unit.
- A nickel has mass of about 5 grams, and the mass of a baseball is about 150 grams.

**Volume**

- The amount of space that matter occupies is called its
**volume**. - Solids, liquids, and gases all have volume.

- The volume of rectangular objects, such as a brick, can be found by multiplying the measurements of length, width, and height.

- When you multiply these measurements, you must multiply the units as well as the numbers.

**Common Units of Volume**- A common unit of volume is the cubic centimeter (cm3).
- Other units of volume include the liter (L) and the milliliter (mL).
- A millimeter is exactly 1 cubic centimeter.
- There are 1,000 millimeters in one liter.