# What are milliliters used to measure

### Volume or volume

Do you have a bathtub or shower at home? How much water actually fits in a full bathtub?

Image: iStockphoto.com (www-AmirG-at)

At some schools there is an “Aquarium” working group. There should be about 2 liters of water in an aquarium for every centimeter of fish length. How much water is there in such an aquarium?

Image: Juniors Bildarchiv GmbH

The space that the bathtub or aquarium takes up is called volume.

### Volume units

The aquarium and the bathtub are bodies. To indicate the size of bodies, you need new units.

Meters (m) or square meters (m²) no longer work. You can enter a length in m and an area in m², but not the volume. In terms of volume, in addition to length and width, you also have the height.

For the volume you calculate width times length times height.
With units: m by m by m. That makes m³. This is the new unit for volume: cubic meter m³.

It works like this with all units of length that you know:
Cubic millimeters mm³ and cubic centimeters cm³ and ...

### The cubic meter (m³)

Now what is a cubic meter? A cubic meter describes the volume that a body occupies that is 1 m long, 1 m wide and 1 m high. You guessed it: the body is a cube.

A large garbage container has roughly the volume of 1 m³.

Image: fotolia.com (eyetronic)

#### Further examples:

• Advertising pillar (approx. 4.3 m³)

Image: Druwe & Polastri

• a 100 m² apartment with a normal height of 2.4 m (approx. 240 m³).

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### The cubic decimeter (dm³)

A cubic decimeter describes the volume that a body occupies that is 1 dm long, 1 dm wide and 1 dm high. The body is a cube.

You actually already know 1 dm³! 1 dm³ is the same volume as 1 liter!

A cubic decimeter (1 dm³) is much smaller than a cubic meter. (1 m³). 1 dm³ is a thousandth of 1 m³!

#### Examples:

• Milk carton (1 dm³ \$\$ = \$\$ 1 l)

Image: Druwe & Polastri Image: Hans Tegen

• Handball (3.45 dm³)

• Aquarium (e.g. 100 dm³ \$\$ = \$\$ 100 l)

• Brick (1,435 dm³)
Image: fotolia.com (Marco2811)

1 liter is the same as 1 dm³. You mostly use liters for liquids.

### The cubic centimeter (cm³)

It continues with an even smaller unit:

A cubic centimeter describes the volume that a body occupies that is 1 cm long, 1 cm wide and 1 cm high. The body is a cube.

1 cubic centimeter takes up the same volume as 1 milliliter (1 ml). A cubic centimeter (1 cm³) is one thousandth of a cubic decimeter
(1 dm³).

#### Examples

• Sugar cubes (2.56 cm³)

• Cherry (approx. 4 cm³)

Image: fotolia.com (Karin Jähne)

1 cm³ is the same as 1 ml. You use milliliters for liquids.

### Cubic millimeters (mm³) and cubic kilometers (km³)

You rarely need cubic millimeters (mm³) and cubic kilometers (km³).

A Cubic millimeter describes the volume of a cube that is 1 mm long, 1 mm wide and 1 mm high.

#### Examples:

• Grain of sand (approx. 2 mm³)

• Peppercorn (30 mm³)

• Pea (100 mm³)

A Cubic kilometers describes the volume of a cube that is 1 km long, 1 km wide and 1 km high.

#### Examples:

• Water volume of smaller lakes, e.g. Starnberger See (approx. 3 km³)

Image: Panther Media GmbH (Peter Ammel)
• Water volume of the Baltic Sea (20,000 km³)

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