Density of Water

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Density of Water

• Kathryn Buckingham
• kbucking_at_nmu.edu

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Density is

• Mass per unit volume of a substance, usually
  expressed as grams per cubic centimeter (g/cm3)
• Also can be thought of as how heavy something is
  for its size.
• Example something with low density is
  lightweight for its size and something with high
  density is heavy for its size.

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Two major effects on Density

• Salinity (amount of salt) and Temperature
• An increase in salt increases seawater density
  because it adds dissolved substances to the
  water.
• An increase in temperature decreases seawater
  density because of thermal expansion.
• Thermal expansion is heat expanding and spreading
  in the water.

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• Temperature has the most impact on density
  because the variations in temperature are greater
  than the salt variations.
• Cold water with high salinity levels are some of
  the highest density water sources.

Information courtesy of Earth Science 10th
Edition by Tarbuck and Lutgens
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The density of water is

• 1000 kg/m3 (or 1 g/cm3 )
• Here is a site with 150 different liquids and
  their densities.
• http//www.simetric.co.uk/si_liquids.htm

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Lets see the difference in Density ourselves!?

• We are going to make
• Click here for instructions in a pdf file
• http//ellerbruch.nmu.edu/classes/CS255F04/cs255st
  udents/kbuckingham/P12/water.pdf

"Density in a Bottle"
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Density Fun for Everyone!

• Here are some fun sites online for you to try at
  home, at school, or with friends to make learning
  about density even more exciting!
• ? Activity of Liquid Density http//www.iit.edu/s
  mile/ch9104.html
• ? Poor Mans Lava Lamp
• http//www.oozinggoo.com/ll-form2.html

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• Hope this has helped you in your understanding of
  density by creating models to show the different
  densities.
• Click here to go back to Density of Water Page
• http//ellerbruch.nmu.edu/classes/CS255F04/cs255st
  udents/kbuckingham/P12/water.html