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Density

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Density

  1. 1. By Aditi Atmasidha
  2. 2.   Density of a substance is a measure of the amount of matter that is present in a certain volume of it.  Density = mass/volume  The SI unit of density is kg/cu. m { Cubic Meter }  Higher the density the substance or the material is heavier.  The density of water is take as 1 kg per cu. m or 1 gram/ cc { Cubic centimeter }  The substances whose density is higher than water sink in water, while those who have low density than water floats on water. What is Density?
  3. 3.  Density Formula & Example
  4. 4.   Low density: Crude oil, edible oil, Cotton, Cork , etc..  High density: Stone, Copper, Sea water, Lead. Examples
  5. 5.   To measure the Density of rectangular solid block:  Check the top-pan balance, if it reads zero.  Keep the block on top- pan balance and read the scale, record the mass in grams.  Find the volume of block by formula: v = { l*b*h }, record the volume in cubic centimeter, followed by Density. Experiments
  6. 6.   Determine the density of irregular solid { Pebbles }  Find the mass of empty cylinder { m1 }. Pour water up to volume { v1 } and find it’s mass.  Mass of water = m = m2 – m1.  Find the volume of pebble v = v2 – v1. { slide no. 7 }. Experiments
  7. 7.  Experiments
  8. 8.  Liquid Density { Kg/m.cu } Mercury 13550 Water at 4 degree Celsius 1000 Corn oil 900 Turpentine 860 Paraffin oil 800 Methylated spirits 790 Density of Some Liquids
  9. 9.   To measure the density of air:  http://www.youtube.com/watch?v=n0zEDSapU4M Density of Some Gases Gas Density/ kg/ m.cu Hydrogen 0.089 Air 1.29 Oxygen 1.43 Carbon dioxide 1.98
  10. 10.   Density of gases change as its pressure and temperature change.  The Density of gases are compared by measuring them at the same temperature and pressure. This is called the standard temperature and pressure. The standard temperature is 0 degree Celsius.  The standard pressure of a gas is the pressure that will support 760 mm of mercury in a vertical tube.  When two gases meet the less dense gas rises above the denser gas. Density of Some Gases
  11. 11.  Floating & Sinking Floating  Density of a substance is less than Density of solvent.  Substance is less dense than solvent.  Example – wood floating on water Sinking  Density of substance is greater than Density of solvent.  Substance is more dense than solvent.  Metal coin sinks in the water.

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