pd.7 group#5

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pd.7 group#5

  1. 1. By : Erin Taylor
  2. 3. <ul><li>Isobars that are close together indicate a large pressure difference over a small area. </li></ul><ul><li>A large pressure difference causes strong winds . </li></ul><ul><li>Isobars that are spread apart indicate a smaller difference in pressure. </li></ul><ul><li>Winds in this area are gentler. </li></ul>
  3. 4. <ul><li>Isobars also indicate the locations of high-and low-pressure areas. </li></ul><ul><li>Temperature is defined as the level of thermal energy, where temperature is the driving force of thermodynamic flow.  </li></ul>
  4. 5. <ul><li>Three of the most commonly used scales for measuring temperature are : Celsius or Centigrade = C  Fahrenheit = F  Kelvin = K  </li></ul>
  5. 6. <ul><li>Air pressure changes with altitude. When you move to a higher place, say a tall mountain, air pressure decreases because there are fewer air molecules as you move higher in the sky. </li></ul><ul><li>If a high pressure system is on its way, often you can expect cooler temperatures and clear skies. If a low pressure system is coming, then look for warmer weather, storms and rain. </li></ul>
  6. 7. <ul><li>Air pressure is the weight of the atmosphere pressing down on the earth. It is measured by a barometer in units called millibars. Most barometers use mercury in a glass column, like a thermometer, to measure the change in air pressure. </li></ul>

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