Which do you think would
have the greater mass and
greater volume? Why?
 1 kg of feathers
 1 kg of rock
Anything that doesn't matter has no mass.
Matter is any substance which:
1.Has mass
2.Occupies space (i.e. has volume)
Volume – amount
of space an object
takes up
Indirectly
Mass is the amount of Matter in an object
Weight is the gravitational
force acting on an object
o
o
o
o
Grams
(g)
Kilograms (kg)
1 kg = 1000 g, kilo means thousand
0.001 kg = 1 g
o To convert grams to kilograms,
divide the number of grams by 1000
o To convert kilograms to grams,
multiply the number of kilograms by 1000
To find the density
1- Find the mass of the
object
2- Find the volume of
the object
3- Divide
Density =
Mass_
Volume
Density is just the amount of matter within a certain volume.
To find density:
1)
Find the mass of the object
2)
Find the volume of the object
3)
Mass Divided by Volume
Ex. If the mass of a liquid is 35 grams and it takes up 7 mL of
space, calculate the density.
D=
𝑀
𝑉
=
35 𝑔
7 𝑚𝐿
=
5𝑔
𝑚𝐿
Liquids and Gases have the density units: g/mL
To find density:
1)
Find the mass of the object
2)
Find the volume of the object
3)
Mass Divided by Volume
Ex. If the mass of an object 45 grams and its volume is 9 cm3,
calculate the density.
D=
𝑀
𝑉
=
45 𝑔
9 𝑐𝑚3
Solids have the density units: g/cm3
=
5𝑔
𝑐𝑚3
To find volume from density:
Ex. If the mass of an object 60 grams and
its density is 10 g/cm3, calculate the
volume.
V=
𝑀
𝐷
=
60 𝑔
10 𝑔/𝑐𝑚3
=6 𝑐𝑚3
To find volume from density:
Ex. If the volume of an object 4 mL and
its density is 5 g/mL, calculate the mass.
M =D x V =
5𝑔
𝑚𝐿
x 4 mL = 20 g
Sample Density Calculations
A liquid has a mass of 150 g. If its density if 0.95 g/mL, find the
volume of the liquid.
V=
𝑀
𝐷
=
150 𝑔
0.95 𝑔/𝑚𝐿
= 157.9 mL
Sample Density Calculations
 A block of fir measures 10 cm by 8 cm by 3 cm. If its mass is
144 g, find the density of the wood.
Find volume first…..
V=LxWxH
= 10 cm x 8 cm x 3 cm = 240 cm3
D=
𝑀
𝑉
=
144 𝑔
240 𝑐𝑚3
=
0.6 𝑔
𝑐𝑚3
Sample Density Calculations
A liquid has a volume of 1.25 L. Its density is
1.25 g/mL. Find the mass of the liquid.
1.25 L x 1000 = 1250 mL
M =D x V =
1.25 𝑔
𝑚𝐿
x 1250 mL = 1562.5 g
Density and States of Matter
 solids usually have greater densities than
liquids, which usually have greater densities
than gases
 KMT: particles in a solid are tightly packed
together therefore there are more particles in
a given volume than there are in a liquid
having the same volume
 exceptions: liquid mercury is more dense than
many solids; at some temperatures, liquid
water is more dense than solid ice (water is
densest at 4 °C)
 as you increase the temperature of a
substance, its density decreases eg. lava lamp