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Homework Help: Thermal Conductivity Practical

  1. Feb 23, 2005 #1
    Hi there,...this isn't homework..its more to my practical...anyways...from the attachment given..that is the first page of my practical guide....the problem is.....on the procedure part...it asked me to plot a graph of lg temp againts t ....if i do so...how do i get the thermal conductivity of glass as the initial temp is 20 C ?!?...so weird...because i don't get lg 20 as interception from the graph......btw..if i simply assume the gradient of graph plotted is kt/Brx ...then my thermal conductivity of glass is 0.2++....i don't think thats right :(...help me anyone..please

    http://server2.uploadit.org/files/chickens-exp11.jpg [Broken]
     
    Last edited by a moderator: May 1, 2017
  2. jcsd
  3. Feb 23, 2005 #2
    First of all
    What is the unit. IT all depends on the units.
     
  4. Feb 23, 2005 #3

    FredGarvin

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    Science Advisor

    I think you need to look at the slope value again. It should be k/Brx since t is your independent variable and k,b,r and x are all constants. Also, pay heed to Gamma. Units will be your downfall if you are not careful.
     
  5. Feb 24, 2005 #4
    oh..the units are all in W m^(-1) K^(-1)
     
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