Understanding Temperature: Kelvin, Celsius, Fahrenheit and Their Conversion, Exams of Thermodynamics

Download Understanding Temperature: Kelvin, Celsius, Fahrenheit and Their Conversion and more Exams Thermodynamics in PDF only on Docsity! Temperature  Notes   • Kelvin,  Celsius,  Fahrenheit   • Write  notes,  put  in  por7olio.     • Everything  Underlined  –  COPY  IT!   • Study.    Read  over  notes  daily.   • Enjoy  the  learning  process.     • Temperature  is  how  hot  or  cold  something  is.  Temperature  is   really  a  measure  of  how  fast  the  atoms  and  molecules  that  make   up  a  substance  are  moving  (this  movement  is  sub-­‐microscopic;  you   cannot  see  it).     • A  thermometer  measures  the  temperature  of  something,   showing  how  hot  or  cold  it  is.     • There  are  many  different  types  of  thermometers  that  measure   the  temperature  of  different  things.  We  use  thermometers  to   measure  the  temperature  of  the  air,  our  bodies,  food,  and  many   other  things.    There  are  analog  and  digital  thermometers.  An   analog  thermometer  shows  the  temperature  on  a  scale  or  dial;  a   digital  thermometer  shows  the  temperature  as  a  number.     • The  higher  the  number  above  zero,  the  higher  the  temperature.   • A  change  of  one  degree  of   temperature  Celsius  is  the  same  as   a  change  of  one  Kelvin.   • A  change  of  one  degree   Fahrenheit  is  a  smaller  change  in   temperature.     • Each  temperature  scale  is  useful   for  different  things.   •  Fahrenheit  is  a  measure  of  temperature  that   is  abbreviated  F.     •  Water  freezes  at  32°F  and  boils  at  212°F.     •  This  scale  was  developed  by  Gabriel  Daniel   Fahrenheit  in  1714.     •  The  Fahrenheit  scale  is  used  in  the  USA  but   not  in  many  other  countries.   •   The  degrees  in  Fahrenheit  are  smaller  than   those  in  Celsius,  making  weather-­‐related   temperatures  more  easily  wriSen  (without   having  to  use  a  decimal  point).   • Celsius  (also  called  CenTgrade)  is   a  measure  of  temperature  that  is   abbreviated  C.     • Water  freezes  at  0°C  and  boils  at   100°C.     • This  scale  was  developed  by   Anders  Celsius  in  1742.   Conversion  Formulas     If  you  know  the  temperature  in  one  temperature  scale  you  can  use  a   formula  to  figure  out  what  it  is  equivalent  to  in  other  scales.  The  conversion   formulas  are  in  the  table  that  follows.   COPY  THIS  CONVERSION  FORMULA  CHART  IN  YOUR  NOTES   Temperature  Conversion  Formulas:   COPY  THIS  CONVERSION  FORMULA  CHART  IN  YOUR  NOTES   Examples:   •  This  example  problem  illustrates  the  method  to   convert  temperatures  from  Celsius  to  Fahrenheit.   •  Problem:    What  is  the  temperature  in  Fahrenheit  of   20  °C?   •  SoluTon:   •  The  conversion  formula  for  °C  to  °F  is   •  TF  =  9/5(TC)  +  32   •  TF  =  9/5(20)  +  32   •  TF  =  36  +  32   •  TF  =  68  °F   •  Answer:    The  temperature  in  Fahrenheit  of  20  °C  is   68  °F.   COPY  THIS  INFORMATION  IN  YOUR  NOTES