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Thermodynamics

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Thermodynamics

  1. 1. + T = Hint: It s the quantity of thermal energy given-off by a body He
  2. 2. + ature = Hint: The measure of the hotness or coldness of a body
  3. 3. + + namics = Hint: A branch of physics die no "s"
  4. 4. Prepared by: MR. LAURO A. CALIVA HEAT and TEMPERATURE
  5. 5. Heat and Temperature <ul><li>THERMAL ENERGY is the kinetic energy characterized by the randomness of motion at the atomic and molecular levels of a body. </li></ul><ul><li>HEAT is the quantity of thermal energy absorbed or given-off by a body. </li></ul><ul><li>TEMPERATURE is the measure of hotness or coldness of a body. </li></ul>
  6. 6. Heat and Temperature <ul><li>THERMODYNAMICS is a branch of physics concerned with the mechanical work, pressure, temperature and their roles in the transformation of energy. </li></ul>
  7. 7. ACTIVITY TIME
  8. 8. Sources of Heat <ul><li>Natural Sources </li></ul><ul><ul><li>The Sun </li></ul></ul><ul><ul><li>The Earth’s Interior </li></ul></ul><ul><li>Artificial Sources </li></ul><ul><ul><li>Chemical Action </li></ul></ul><ul><ul><li>Electrical Energy </li></ul></ul><ul><ul><li>Mechanical Energy </li></ul></ul><ul><ul><li>Nuclear Energy </li></ul></ul>
  9. 9. Measure of Heat <ul><li>THERMOMETER is any thermal sensor that measures temperature. </li></ul><ul><li>The lines of a thermometer are called CALIBRATIONS . </li></ul><ul><li>LIQUID-IN-GLASS THERMOMETER ROTARY THERMOMETER , THERMOCOUPLE THERMOMETER and LIQUID CRYSTAL THERMOMETER are a few examples. </li></ul>
  10. 10. 1. LIQUID-IN-GLASS THERMOMETER <ul><li>Consists of a glass tube with a bulb on one end. </li></ul><ul><li>The glass bulb contains a liquid (mercury or alcohol) that expands and narrows up. </li></ul>
  11. 11. 2. ROTARY THERMOMETER <ul><li>Consists of coiled bimetallic strips. </li></ul><ul><li>One strip is brass and the other is iron-made. </li></ul><ul><li>The metals expand at different rates. </li></ul>
  12. 12. 3. THERMOCOUPLE THERMOMETER <ul><li>An electronic thermometer. </li></ul><ul><li>It operates under the principle of measuring changes in electric signal. </li></ul><ul><li>It consists of two wires of different metals joined together at the ends to form junctions, and a display (to show the temperature). </li></ul>
  13. 13. 3. LIQUID CRYSTAL THERMOMETER <ul><li>Consists of a strip of liquid crystals that changes color with temperature. </li></ul><ul><li>Convenient to use but not very accurate. </li></ul>
  14. 14. TEMPERATURE SCALES <ul><li>In CELSIUS SCALE , the freezing point of water is 0 while the boiling point is 100 degrees Celsius. </li></ul><ul><li>In FAHRENHEIT SCALE , the freezing point of water is 32 while the boiling point 212 degrees Fahrenheit . </li></ul>
  15. 15. TEMPERATURE SCALES <ul><li>In KELVIN SCALE, the freezing point of water is 273 K while the boiling point of water is 373 K. </li></ul>

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