WHAT IS DENSITY?. DENSITY (definition). The measurement of how much mass is contained in a given volume. Different substances may have the same mass but don’t fill the same volume!. The density of a substance is the same for all samples of that substance. HOW DO WE CALCULATE DENSITY?.
Objects with a density of less than 1-g/mL will float on top of water.
Objects with a density greater than 1 g/mL will sink in water.Floating and Sinking
Fish and submarines control their depth by changing their density.Neutral Buoyancy
What is the density of this enormous, steel hulled ship, full of machinery, coal, people, and all sorts of heavy things?
It’s floating, so it’s density must be less than 1 g/mL.
How can this be?
The Titanic is a hollow vessel full of air!Titanic Sails the Ocean Blue
What happened to her density?
As she took on more and more water, her density got closer and closer to 1 g/mL.
The denser the ship became, the lower she settled into the water.Titanic verses Iceberg
Must be greater than 1 g/mL, as her steel hull is full of water instead of air.Wreck of the Titanic