# Homework Help: Thermal Conductivity Practical

1. Feb 23, 2005

### chickens

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

Last edited by a moderator: May 1, 2017
2. Feb 23, 2005

### Gamma

First of all
What is the unit. IT all depends on the units.

3. Feb 23, 2005

### FredGarvin

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.

4. Feb 24, 2005

### chickens

oh..the units are all in W m^(-1) K^(-1)