Denisty

Density

The amount of mass in a given volume. How condensed the atoms are in matter.

DENSITY is (by definition) Mass per unit volume

To calculate density, we say, DENSITY = ^MASS/ _VOLUME

Units for density are g/cm³ for solids or g/mL for liquids.

Each substance has a different density. Each pure substance has a specific density that will not change. For example, aluminum has a density of 2.7 g/cm³ and gold has a density of 19.3 g/cm³. Each element on the periodic table is a pure substance and has its own unique density. . . and can be used to help you identify a substance. Example: Google and find out which element has a density of 13.5g/cm³

Density is a physical property of a substance

Mass

MASS is measured in grams (g), using a balance.

Mass= Density x Volume

Mass and weight are NOT the same thing. Weight is a measure of the force of gravity acting on an object (pulling), while mass is the amount of matter.

Volume

VOLUME is the amount of space an object takes up. Volume is measured in one of three ways.

1. Liquid volume is measured in a graduate (graduating cylinder) in units of milliliters (ml)

2. Multiply Length x width x height to find the volume of objects with straight sides.

3. Water Displacement – Measure water. Place object in water making sure you used enough water to cover object. Water has been “displaced” as it moves up as a result of the object taking up space. Determine how much the water has moved up. This is the volume. Since the object is a 3-D solid object, instead of liquid, you would use the unit cm³.

1ml = 1cm³

If the water moves up 20 ml, after an object is placed in the water, then the object is equal to 20 cm³

Volume= Mass / Density

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