2. Properties of Fluids Density, Buoyancy & Viscosity E. Trevino

3. IPC (7) The student knows relationships exist between properties of matter and its components. 7A The student is expected to investigate and identify properties of fluids including density, viscosity, and buoyancy.

4. FLUID When atoms or molecules are free to flow past each other they are called fluids. Fluids can be...

5. liquids, or gases!

6. Three measurable properties of fluids are: Density Buoyancy Viscosity

7. Density is the mass per unit of volume of a substance or mathematically D = M / V Which cube is denser? Cube 1 Cube 2

8. Density problem solved!!!! Both cubes have the same volume, but Cube 1 has more molecules so it is denser than the Cube 2!

9. Property 2: Buoyancy Buoyancy: a force that acts upward on an object submerged in a liquid or floating on the liquid’s surface example?……stay tuned!

10. How does a fish swim through the weight of all the fluid?

11. BUOYANT FORCES!!!  Buoyant force!! Weight of fish 

12. Property 3: Viscosity Viscosity is a fluid’s resistance to flow.

13. Viscosity: Problem: Three black marbles are dropped at the same time into three different fluids - oil, water, and glycerol. Will they all fall at the same rate of speed?

14. A: The marble will drop the fastest in the water and slowest in the glycerol. The reason is due to the different viscosities of the fluids.

15. What we learned… Because of the properties of fluids, humans learned how to fly and make life more practical and fun!

16. CREDITS 1. Density cubes http://www.nyu.edu/pages/mathmol/textbook/density2.html 2. Bernoulli’s cartoon www.pilotsweb.com/principle/ bernoulli.htm 3. Oil pictures: www.watase.jp/oildonys/image/up.jpg 4. Viscosity cylinders http://www.physics.ubc.ca/~outreach/p420_96/amber_anthony/app 3a.html