Density Mass per unit volume

Mass  amount of matter in a body  Measured in kg  Measured with balance

Graduated Cylinder Always read the bottom of the meniscus measuring volume

Volume

 Space occupied by a body  Measured in l or m 3  Use graduated cylinder (liquid)  Calculate l x w x h  Measure fluid displacement

Density  Mass per unit volume  D = m 1 V  Describes the crowdedness of the matter in a body  Is constant for a uniform material under constant temperature and pressure  Generally less dense stuff floats on more dense stuff ______

M = 6g V = 4cm 3 D =

“Crowdedness”

M = 4g V = 1cm 3 D = M = 6g V = 1cm 3 D = M = 16g V = 4cm 3 D =

Which of these could be the same uniform material at the same temp and pressure?

M = 4g V = 1cm 3 D = M = 6g V = 1cm 3 D = M = 6g V = 4cm 3 D = M = 16g V = 4cm 3 D =

What would be the density of another sample of the same uniform material that is 8cm 2 ?

Draw it M = 6g V = 4cm 3 D =

Degree of floating • Water at 4 degrees Celsius has a density of 1g/mL • Objects with densities less than 1g/ml generally float in water.

• The density is the fraction that rest below the surface • Archimedes Principle

Archimedes Principle