Density of Fluids Properties of Matter

Density of Fluids Key concepts: How does the density of a material change as the temperature changes? Fluids – liquids and gases Mass remains the same from solid to liquid to gas, but volume changes.

Density of Fluids What is a fluid? Measuring density of a liquid m D V Any matter that has the ability to flow Liquids, gases Measuring density of a liquid The method remains the same: D=m/v Units: g/mL m D V

Density of Fluids The volume of liquid silver The mass remains the same as when it was solid The volume has changed! When it was a solid, the atoms were in fixed positions As a liquid, the atoms are moving more freely and farther apart, taking up more space

Density of Fluids Compare the density of a solid to that substance as a liquid If you increase the volume you will decrease the density Solids will even change density as they are heated and cooled even before they melt due to the increased vibration of the molecules

Density of Fluids Water Most materials are more dense as a solid than in their liquid state Water is a notable exception – ice is less dense than liquid water!! It floats. When water freezes, its crystal structure has a large amount of empty space, causing the volume to increase.

Density of Fluids Imagine you are an aquatic animal (frog, fish, turtle, etc). Describe how life would be different if ice were more dense than water.