Examples: Olive oil has 0.85 g / cm 3 (or 0.85 g / mL). 1 mL of olive oil has a mass of 0.85 grams....
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Transcript of Examples: Olive oil has 0.85 g / cm 3 (or 0.85 g / mL). 1 mL of olive oil has a mass of 0.85 grams....
Examples:
Olive oil has 0.85 g / cm3 (or 0.85 g / mL).1 mL of olive oil has a mass of 0.85 grams.
Iron has 7.8 g / cm3.
1 cm3 of iron has a mass of 7.8 grams.
Maple wood has 0.7 g / cm3.
1 cm3 of maple wood has a mass of 0.7 grams.
Glass has 2.5 g / cm3.
1 cm3 of glass has a mass of 2.5 grams.
Sink or Float in Water?
Material Density (g/cc) Sink or Float?4. Copper 8.93. Brass 8.42. Steel 7.61. Aluminum 2.76. Acrylic 1.25. Oak 0.87. Nylon 1.19. Pine 0.4 10. Poplar 0.6 8. PVC 1.312. Polypropylene 0.9 11. Ironwood 1.2
Floating / sinking rule for fresh water:
If the object’s density is LESS
THAN 1 g/cc, then it will FLOAT
If the object’s density is GREATER THAN 1 g/cc, then it
will SINK
So how can a ship that weighs several tons float on water???
Hint: Look at the simplified cross-section of a boat below:
• Most of the inside is open space. • So most of the volume of the boat is
made up of air!• So when you take into account all the
metal and the air, the average density of the boat is less than 1 g/cc!!
What about other liquids?
The density of rubbing alcohol
is about 0.8 g/mL
The density of polypropylene
is 0.9 g/cc
Polypropylene will SINK in rubbing alcohol because polypropylene is more dense than
rubbing alcohol.
General Rule:A substance will SINK in
a substance that is less dense than itself.
A substance will FLOAT in a substance that is more dense than itself.