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Density

Density. A physical property. Density. Density - the amount of mass per unit of volume. It can be expressed in the following formula. . Density. The formula… Density = mass volume Or D=m/v. Understanding Density.

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Density

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  1. Density A physical property

  2. Density Density - the amount of mass per unit of volume. It can be expressed in the following formula.

  3. Density • The formula… Density = mass volume Or D=m/v

  4. Understanding Density • In order to understand density, you must first understand mass and volume. • Mass-The amount of matter in an object. (balance/scale) • Volume-The amount of space occupied by an object. (ruler and formula or graduated cylinder) • So density is just the amount of matter in an object divided by the space that the object occupies.

  5. Density • Density = mass / volume • Density compares mass to volume. • If you have any two components, you can “figure out” mathematically the third component by substituting the numbers in the formula. (D=m/v)

  6. Density • Density = mass / volume • To calculate density, substitute numbers (preferable from your data) for mass and volume. • You would use a scale or a balance to find mass, and you could either use a formula (l x w x h) or use a graduated cylinder to find volume.

  7. Volume The formula for volume is … V = l x w x h (volume = length x width x height) Or, you could simply see how much water a solid or liquid object displaces in a graduated cylinder.

  8. Density • You can even determine the relative densities of liquids by the layers that are formed when they are mixed, or what floats upon what. • More dense substances sink. • Less dense substances float.

  9. Density of Water • The density of water is 1gram per milliliter, or D=1g/ml • Substances that are more dense than 1g/ml will sink when placed in water. • Substances that are less dense than 1g/ml will float when placed in water.

  10. Density in Solids • A couple of video clips might help with your understanding… • D = m/v……………..where v = l x w x h • Practical applications of density

  11. Density in Liquids • A couple of video clips might help with your understanding… • When liquids don’t mix • Density of water, sinkers and floaters

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