Ppt Measurements Unit 1

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Ppt Measurements Unit 1

  1. 1. MEASUREMENT
  2. 2. S.I. UNITS <ul><li>Le system International d’unites </li></ul><ul><li>A modification of the older French metric system. </li></ul>
  3. 3. Base Units <ul><li>Base units are considered so because they are not derived from any pre-existing number or formula. We need to be able to discuss things like distance, temperature and time, and we do so by agreeing to a reliable definition of some basic (base!) facts. </li></ul>
  4. 4. Base Units <ul><li>Length </li></ul>
  5. 5. Base Units <ul><li>Length </li></ul><ul><li>Meter </li></ul>
  6. 6. Base Units <ul><li>Length </li></ul><ul><li>Meter </li></ul><ul><li>(m) </li></ul>
  7. 7. Base Units <ul><li>Mass </li></ul>
  8. 8. Base Units <ul><li>Mass </li></ul><ul><li>Kilogram </li></ul>
  9. 9. Base Units <ul><li>Mass </li></ul><ul><li>Kilogram </li></ul><ul><li>(kg) </li></ul>
  10. 10. Base Units <ul><li>Time </li></ul>
  11. 11. Base Units <ul><li>Time </li></ul><ul><li>Seconds </li></ul>
  12. 12. Base Units <ul><li>Time </li></ul><ul><li>Seconds </li></ul><ul><li> (s) </li></ul>
  13. 13. Base Units <ul><li>Temperature </li></ul>
  14. 14. Base Units <ul><li>Temperature </li></ul><ul><li>Kelvin </li></ul>
  15. 15. Base Units <ul><li>Temperature </li></ul><ul><li>Kelvin </li></ul><ul><li>(K) </li></ul>
  16. 16. Base Units <ul><li>Amount of Substance </li></ul>
  17. 17. Base Units <ul><li>Amount of Substance </li></ul><ul><li>mole </li></ul>
  18. 18. Base Units <ul><li>Amount of Substance </li></ul><ul><li>mole </li></ul><ul><li>(mol) </li></ul>
  19. 19. Base Units <ul><li>Electric Current </li></ul>
  20. 20. Base Units <ul><li>Electric Current </li></ul><ul><li>Ampere </li></ul>
  21. 21. Base Units <ul><li>Electric Current </li></ul><ul><li>Ampere </li></ul><ul><li> (A) </li></ul>
  22. 22. Base Units <ul><li>Luminous Intensity </li></ul>
  23. 23. Base Units <ul><li>Luminous Intensity </li></ul><ul><li>candela </li></ul>
  24. 24. Base Units <ul><li>Luminous Intensity </li></ul><ul><li>candela </li></ul><ul><li> (cd) </li></ul>
  25. 25. Derived Units <ul><li>Area </li></ul>
  26. 26. First Derivative <ul><li>Area </li></ul><ul><li>length squared </li></ul>
  27. 27. Derived Units <ul><li>Area </li></ul><ul><li>length squared </li></ul><ul><li> (m 2 ) </li></ul>
  28. 28. Second Derivative <ul><li>Volume </li></ul>
  29. 29. Second Derivative <ul><li>Volume </li></ul><ul><li>length cubed </li></ul>
  30. 30. Second Derivative <ul><li>Volume </li></ul><ul><li>length cubed </li></ul><ul><li> (m 3 ) </li></ul>
  31. 31. Derived Units <ul><li>Density </li></ul>
  32. 32. Derived Units <ul><li>Density </li></ul><ul><li>mass per unit volume </li></ul>
  33. 33. Derived Units <ul><li>Density </li></ul><ul><li>mass per unit volume </li></ul><ul><li> (kg/m 3 ) </li></ul>
  34. 34. First Derivative <ul><li>Speed (velocity) </li></ul>
  35. 35. Derived Units <ul><li>Speed (velocity) </li></ul><ul><li>distance traveled per unit time </li></ul>
  36. 36. Second Derivative <ul><li>Speed (velocity) </li></ul><ul><li>distance traveled per unit time </li></ul><ul><li> (m/s) </li></ul>
  37. 37. Third Derivative <ul><li>Acceleration </li></ul>
  38. 38. Third Derivative <ul><li>Acceleration </li></ul><ul><li>speed changed per unit time </li></ul>
  39. 39. Derived Units <ul><li>Acceleration </li></ul><ul><li>speed changed per unit time </li></ul><ul><li> (m/s 2 ) </li></ul>
  40. 40. Derived Units <ul><li>Force </li></ul>
  41. 41. Derived Units <ul><li>Force </li></ul><ul><li>mass times acceleration of an object </li></ul>
  42. 42. Derived Units <ul><li>Force </li></ul><ul><li>mass times acceleration of an object </li></ul><ul><li> (kg m/s 2 ) </li></ul>
  43. 43. Derived Units <ul><li>Force </li></ul><ul><li>Note: </li></ul><ul><li>(kg m/s 2 ) = Newton (N) </li></ul>
  44. 44. Derived Units <ul><li>Pressure </li></ul>
  45. 45. Derived Units <ul><li>Pressure </li></ul><ul><li> Force per unit area </li></ul>
  46. 46. Derived Units <ul><li>Pressure </li></ul><ul><li> Force per unit area </li></ul><ul><li>(kg /m s 2 ) or N/m 2 </li></ul>
  47. 47. Derived Units <ul><li>Pressure </li></ul><ul><li>Note: </li></ul><ul><li>(kg /m s 2 ) = N/m 2 = Pascal (Pa) </li></ul>
  48. 48. Derived Units <ul><li>Energy </li></ul>
  49. 49. Derived Units <ul><li>Energy </li></ul><ul><li>Force times distance traveled </li></ul>
  50. 50. Derived Units <ul><li>Energy </li></ul><ul><li>Force times distance traveled </li></ul><ul><li>(kg m 2 /s 2 ) </li></ul>
  51. 51. Derived Units <ul><li>Energy </li></ul><ul><li>Note: </li></ul><ul><li>(kg m 2 /s 2 ) = Joule (J) </li></ul>
  52. 52. Other Units to Know About <ul><li>Length </li></ul><ul><ul><li>Angstrom ( Å) = 10 -10 m </li></ul></ul>
  53. 53. Other Units to Know About <ul><li>Pressure </li></ul><ul><li>Atmosphere (atm) def.- the pressure exerted by the earth’s armosphere at sea level on an average day. </li></ul><ul><li>torr or mm of Mercury (mmHg) def.-the pressure exerted by a column of mercury (Hg) 1 mm high. </li></ul>
  54. 54. Other Units to Know About <ul><li>Temperature </li></ul><ul><ul><li>3 common scales </li></ul></ul><ul><ul><li>Fahrenheit </li></ul></ul><ul><ul><li>Celsius </li></ul></ul><ul><ul><li>Kelvin </li></ul></ul>
  55. 55. Temperature In the fahrenheit scale, what is the temperature of freezing and boiling water?
  56. 56. Temperature Freezing Pt Boiling Pt 32 °F 212 °F
  57. 57. Temperature Other Units to Know About <ul><li>Length </li></ul><ul><ul><li>Angstrom ( Å) = 10 -10 m </li></ul></ul>In the Celsius scale, what is the temperature of freezing and boiling water?
  58. 58. Temperature Freezing Pt Boiling Pt 32 °F 212 °F 0 °C 100 °C
  59. 59. <ul><li>In the Kelvin scale, what is the temperature of freezing and boiling water? </li></ul>Temperature
  60. 60. Temperature <ul><ul><ul><li>Freezing Pt Boiling Pt </li></ul></ul></ul><ul><li>32 °F 212 °F </li></ul><ul><li> 0 °C 100 °C </li></ul><ul><li>273.15 K 373.15 K </li></ul>
  61. 61. Temperature <ul><li>Formulas for converting scales </li></ul><ul><ul><ul><li>°C + 273.15 = K </li></ul></ul></ul><ul><ul><ul><li>1.8(°C ) + 32 = °F </li></ul></ul></ul>
  62. 62. Other units to know about <ul><li>Volume </li></ul><ul><li>Liter (l) = 1 dm 3 </li></ul><ul><ul><ul><li>1 l = 1.06 qt </li></ul></ul></ul><ul><ul><ul><li>1 ml = 1 cm 3 </li></ul></ul></ul>

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