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FLOATS OR SINKS

FLOATS OR SINKS. DENSITY. Density. It is a measure of compactness of how much mass is tightly squeezed into a given volume. Is the ratio of mass and volume in an object. D= M/V g/ml or g/cm3. DENSITY. D = m/v (g/cm 3 ) (g/ml) Mass usually expressed in grams

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FLOATS OR SINKS

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  1. FLOATS OR SINKS DENSITY

  2. Density It is a measure of compactness of how much mass is tightly squeezed into a given volume. Is the ratio of mass and volume in an object. D= M/V g/ml or g/cm3

  3. DENSITY D = m/v (g/cm3) (g/ml) • Mass usually expressed in grams • Volume usually expressed in cm3 or milliliters, etc.

  4. Density • Density = amount of matter per unit volume • Density is the ratio of mass to volume • If the volume stays the same and the mass increases . . . the density will increase • If the mass stays the same and the volume increases . . . The density will decrease

  5. M ÷ ÷ DXV Mass= Density = Volume= M V M D The “DMV” Triangle forVolume, Mass, and Density DxV

  6. How close the atoms or molecules are to each other More than “heaviness” - density includes how much space an object takes up!! All substances have density including liquids, solids, and gases Density is the measure of the “compactness” of a material

  7. What would take up more space??? A kilogram of feathers…..or a kilogram of steel?? OR

  8. “Compactness”

  9. Density The density of water is 1.0 g/ml Objects with densities greater than 1.0 g/ml will sink in water

  10. Density Objects with densities less than 1.0 g/ml will float on water

  11. Ice Ice floats therefore it is less dense than water Ice mostly remains underwater with only a portion of it being exposed

  12. Solids Ice vs. water…..

  13. Gases • How much kinetic energy do the molecules have?? • The greater the kinetic energy • ……the greater the volume • …… and the less dense that gas is!! • Therefore, cold air is more dense than warm air

  14. Low pressure weather system means warmer air tends to rise, High pressure systems indicate a colder more dense air mass that will……. SINK!!!

  15. LIQUIDS • The more dissolved solids in a solution, the more dense (such as ocean water) • Cold water in lakes tend to sink (this creates a constant mixing of water, nutrients, and other substances) • Kinetic energy again!! Denser layers to less dense layers…..

  16. What would happen???? • Mercury density = 13600kg/m3 • Lead density = 11340kg/m3

  17. Lead floats on liquid mercury!

  18. Solids Ice vs. water…..

  19. SOLIDS • Ice is less dense than water (which is why lakes and ponds have a thin layer of ice covering in winter, with water underneath) • Various rocks, woods, metals have a characteristic density specific to that substance Wouldn’t you like to have a bunch of THIS dense material?

  20. Archimedes and the Kings Crown http://3quarksdaily.blogs.com/3quarksdaily/images/2007/07/18/archimedes.jpg

  21. Calculations If 96.5 grams of gold has a volume of 5 cubic centimeters, what is the density of gold?

  22. Calculation If 96.5 g of aluminum has a volume of 35 cm3, what is the density of aluminum?

  23. Calculation If the density of a diamond is 3.5 g/cm3, what would be the mass of a diamond whose volume is 0.5 cm3?

  24. What is specific gravity? A comparison of the density of a substance and the density of water is specific gravity

  25. Density Table SINK or FLOAT In Water (D = 1.0 g/mL) Float Float Float Sink Sink Sink Float (alcohol) Float (fuel)

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