2 - DENSITY

Density

is a characteristic property of a substance

Density

a measure of how much mass (how much "stuff") is packed into a certain volume (how much space an object takes up).

same / constant

The density of a substance is the ____ or _____ regardless of size and mass.

Density = mass/volume

Equation of Density

• g/cc

• slug / ft.³

• kg / m³

Units of density: (3)

• dyne / cc

• pound / ft.³

• newton / m³

Some units of weight density:

Water Displacement Method

The volume of the stone can be found by the __________

graduated cylinder

Use a _______ with water to a certain level & record this as initial volume, V1

V2

Wet the stone before dropping it in to the cylinder. Record the final volume as __

V2 - V1

Calculate the volume of the stone by ______

100-ml beaker.

Determining the density of liquids

• Weigh a clean & dry _______, Record the weight as m1

• graduated cylinder

• weigh

• m2

• Using a ________, measure 10-ml of water.

• Place the water in the beaker & ____ again.

• Record this as ____

m2 - m1

Determine the weight of 10-ml of water by _________

1 g/cc

Density of water

0.928 g/cc

Density of cooking oil

% error = determined value - actual value / actual value (100)

% error:

remove air bubbles that might be trapped on the surface of the stone

Why do you have to wet the stone before dropping it into the graduated cylinder?

measures the volume of an object by observing how much fluid it displaces

What general property of matter is illustrated when the volume of an object is measured by the displacement method?

• initial volume will be higher

• inaccurate mass measurements

• affect both volume of object and water

How will the results be affected by the following conditions?

a. Wet graduated cylinder:

b. Dirty balance pan:

c. Change in temperature:

8.96 g/cc

Density of Copper Wire:

7.85 g/cc

Density of Steel ball:

• V = π(d)² • h / 4

• V = π(d)³ / 6

Density of Solids Formula

• Volume of Cylinder:

m1

Density of Liquids

• mass of empty container

m2

mass of container + liquid

m3

mass of liquid

• m(liquid) = m(container+liquid) - m(empty container)

• m3 = m2-m1

Measure the mass of the liquid: