Density

  Table of Contents ...
 * 1. || What is Density? ||
 * 2. || Comparing Densities of Substances ||
 * 3. || Changing Density ||

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What is density? Density is the amount of matter in a given volume.If you wanted to find out the density of an object you would divide the mass by the volume. Without doing the formula you cant find out density by its self. Derived quantity is also called density because it is found by combining mass and volume.For example, say you have a rock with a volume of 25cm3 and a mass of 54 g. If you divide 54 g by 25cm3 you will get the density of the rock. Units for density are g/cm3, g/mL, kg/m3, and kg/L. Density of a solid would be given in the units of g/cm3 or kg/m3. Comparing Densities of Substances Density is great for identifying substances. Every substance has a density that is different from the densities of others. The density of the substance will always be given at the same pressure and temperature. Some densities of common substances are helium (gas) - 0.000001663g/cm3, oxygen (gas) - 0.001331g/cm3, water (liquid) - 1.00g/cm3, and pyrite (solid) - 5.02g/cm3. For example, you can tell helium and oxygen apart by the densities of both substances. Changing Density If you want to change an objects density there are two different ways. You could either do this by heating or cooling it. If you wanted to change the density of an icecube you could put some in a pot and put it on the stove and turn on the heat. This melts the ice cube and decreases the density. If you wanted to increase an objects density you could cool it. You can do this by taking a container putting water into it and putting that in the freezer. When you take it out after so long it will be frozen the and the now called ice, would have a larger density.

Citations..

Jones, T. Griffith. Prentice Hall Science Explorer. Boston, MA: Pearson / Prentice Hall, 2009. Print.

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