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roderick lopez

on 5 February 2014

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Transcript of Density

Defined: The mass of a substance per unit volume
History of Density
Archimedes' Principle
Density Equation

Which is most Dense?
Density Tower
D = mass = m
volume v
Directly Proportional

Inversely Proportional
to Mass
to Volume
D = mass = m
volume v
Volume changes
Mass stays the same
Mass changes
Volumes stays the same
Word Problems
Iron has a known density of 7.87 g/cm3. What is the mass of a 2.50 cm3 piece of iron?

d = m

What do we know?

d = density =7.87 g/m3
v = volume = 2.50 cm3
m = ?

Mass = Volume x Density = v x d = 4.87 g x 2.50 cm3 = 1,217.5 g
Another Word Problem
A beaker contains 10 ml of liquid. The beaker has a mass of 15 grams when empty. The beaker plus the liquid has a mass of 49 grams. What is the density of the liquid in g/ml?

d = m

What do we know?

v = volume = 10 ml
m (of liquid) = (mass of liquid + beaker) – mass of beaker = 49 g – 15 g = 34 g
d = ?

d = m = 34 g ÷ 10 ml = 3.4 g

v ml
A. Density is DIRECTLY proportional to mass. This means that if volume remains constant, (does not change), density increases as mass increases. And density decreases as mass decreases.

B. Density is INVERSELY proportional to volume. This means that if mass remains constant (does not change), density decreases as volume increases. And as volume decreases density increases.

Directly Proportional
Inversely Proportional
Full transcript