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Salinity, ppm
0 3e415000
0 .25 .5 .75 1 1.25 1.5 1.75 2 2.25 2.5 2.75 3 3.25 3.5
00
.025
.05
.075
.1
.125
.15
.175
.2
.225
.25
.275
.3
.325
.01 km.005 km
t = 0OBLEYML Thu Jun 24 2010
Fluid DensityGCCE Physics Module – Saltwater Intrusion In Response To Sea
Level Rise
What Is Density?
What Is Mass?
• Mass is the total amount of matter in an object
• Measured in grams or kilograms
• Mass can be found from weight using W=mg
What Is Volume?
• Volume is the total amount of space an object occupies.
• Measured in m3 or cm3
What Is Density?• Density is the total mass
contained within a certain volume
• Density is an intrinsic property. It is a property of a substance rather than a property of the amount of a substance. It always stays the same – no matter how much you have!
Substance Density (g/cm3)
Helium 0.00018
Air 0.0012
Propane 0.0018
Olive Oil 0.92
Water 1.00
Honey 1.36
Steel 8
Lead 11.3
Osmium 22.6
If steel sinks, why do ships float?
• The air inside the hull counts as part of the ship’s volume.
• The ship is made of heavy steel, but the ship’s overall density is less than water’s density. So- it floats!!
How do hot air balloons fly?
• Hot air is less dense than cold air.
• The overall density of the balloon and hot air is about the same as cold air.
What makes a submarine sink and surface?
• A submarine has ballast tanks that can be filled with air or water.
• In order to surface, pressurized air pushes water out of the ballast tanks- making it less dense than seawater.
What do we need to calculate density of fluids?
• Remember the units: – kg/m3
– g/cm3