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SI Units

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SI Units

  1. 1. SI Units <ul><ul><li>Length—meter, m </li></ul></ul><ul><ul><li>Mass—kilogram, kg </li></ul></ul><ul><ul><li>Time—second, s </li></ul></ul><ul><ul><li>Temperature—kelvin, K </li></ul></ul><ul><ul><li>Amount of substance—mole, mol </li></ul></ul>
  2. 2. Volume <ul><ul><li>Called a “derived unit” </li></ul></ul><ul><ul><li>Expressed in SI units such as m 3 and cm 3 </li></ul></ul><ul><ul><li>More often in liters, L </li></ul></ul><ul><li>1 L = 1 dm 3 </li></ul>
  3. 3. Area <ul><ul><li>Also a &quot;derived unit&quot; </li></ul></ul><ul><li>  </li></ul><ul><ul><li>Expressed as the square of a unit of length </li></ul></ul><ul><li>  </li></ul><ul><li>  </li></ul><ul><ul><li>Examples: </li></ul></ul><ul><ul><ul><li>m 2 </li></ul></ul></ul><ul><ul><ul><li>cm 2 </li></ul></ul></ul><ul><ul><ul><li>in 2 </li></ul></ul></ul><ul><ul><ul><li>ft 2 </li></ul></ul></ul><ul><ul><ul><li>mi 2 </li></ul></ul></ul>
  4. 4. Density <ul><ul><li>Also a derived unit of measure but unique for each substance </li></ul></ul><ul><ul><li>Density, d, expresses the mass per unit volume </li></ul></ul><ul><li>d = m/V </li></ul><ul><li>V is volume, m is mass </li></ul><ul><ul><li>MEMORIZE this easy equation, you will see it again </li></ul></ul>

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