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Density

Learn about density, its formula, and how it determines if an object floats or sinks. Discover the constant nature of density and how it varies for solids, liquids, and gases. Explore the densities of oil, solids, and gases, and test your knowledge with true or false questions.

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Density

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  1. Density

  2. Formula • The definition of Density is the amount of molecules in a space • The formula to find density is D=M / V • M is for mass which could be measured with a Triple Beam Balance • V is for volume, can be measured with a Graduated Cylinder or a ruler

  3. Floating and sinking • The Density of an object can determine if it floats or sinks • If the Density is greater then 1.0 g/ml the object will sink • If the object has a Density of 0.1g/ml through 0.9 g/ml it will float • If the objects has a Density of 0.5 half of the object will be submerged in water

  4. Floating and sinking (cont) • But if the objects Density of 1.0 it will stay neutral or in the middle of the water

  5. Constant • Density is a Constant • This means the density remains the same, it doesn’t change • For example if you take a cork and cut it in half, the Density will not change • When you cut an object the Mass and Volume change, but the Density remains a constant

  6. Solids, Liquids, and Gases Densities • A solid has a lot of molecules in a given space • The more molecules the more mass which gives it a higher Density, which determines if it sinks or floats • A liquid has not as much mass in a given space this gives it a lower density • And a gas has not much mass for a lot of volume which gives it a lesser Density

  7. Liquid • The oil has a Density less then water which is 1.0 g/ml • This causes it to float on top of the water

  8. Solid • This solid has a Density more then 1.0 g/ml therefore making it sink to the bottom • If the objects Density was 1.0 g/ml it would neither float nor sink

  9. Gas • Gas has a low Density this is why it’s in our air we breathe • The Molecules are very far apart not energetic

  10. True or False • Densities formula D=M/V? • If the object has a Density of 1.1 it’s neutral? • Do you use a scale to find Density? • Solids Densities are always less then 1.0? • Volume can be recorded with a Graduated Cylinder?

  11. Answers • True • False • False • False • True

  12. The End

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