DensityNotes

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Density is a measure of the quantity of mass of a substance that occupies one unit of volume.

Remember: Changes in temperature and pressure have little effect in the densities of liquids and solids.

Also: generally an increase in temperature will increase the volume of the sample while the mass remains constant, thus the density will decrease

Density= mass
volume

Density's units are grams/liters or grams/centimeters cubed

Formula for determining Density:

  1. write out the formula (Density= mass/volume)
  2. determine which part is missing (i.e. either the mass, volume, or density is what you are trying to determine)
  3. plug the numbers you are given into the formula
  4. multipy or divide to determine the answer
  5. check to make sure you have the right answer in the right units with the correct number of significant figures!

Example

Question: A piece of lead has a mass of 22.7 grams and occupies a volume of 2.00 liters. What is the density of the lead?

Solution:

  1. Write out the formula
Density=mass
volume
  1. Plug in the numbers
X=22.7 grams
2.oo liters
  1. Now solve for X:
X=11.4 grams/liters


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Edited May 21, 2003 8:28 am (diff)
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