Presentation on theme: "Fluid Density GCCE Physics Module – Saltwater Intrusion In Response To Sea Level Rise."— Presentation transcript:
Fluid Density GCCE 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 m 3 or cm 3
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! SubstanceDensity (g/cm 3 ) Helium Air Propane Olive Oil0.92 Water1.00 Honey1.36 Steel8 Lead11.3 Osmium22.6
If steel sinks, why do ships float? The air inside the hull counts as part of the ships volume. The ship is made of heavy steel, but the ships overall density is less than waters 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/m 3 – g/cm 3