OBSERVATION TABLE - IN AIR AT 328K
Now we plot a graph between (x-x0) and time/(x-x0)
(x-x0) vs time/(x-x0) plot
Then for the data above we have the least square equation as :
y = 26.17x + 1159
From the graph slope S is = 2.617*10^7 sec/m^2
Operating temperature T = 328K
Vapor pressure or carbon tetrachloride can be obtained from the equation :
Where T is in K and vapor pressure is in Pascal.
For carbon tetrachloride : C1=78.441 , C2=-6128.1 , C3=-8.5766 , C4=6.8465*10(-6) , C5=2
With these values of constants we have the vapor pressure to be 49512.55 pascal =49.512 kN/m2
Total pressure P = 101.32 kN/m2
Kilogram molecular volume of a gas = 22.4 m3 at 273.15 K
Molecular weight of carbon tetrachloride = 154 kg/mol
Density of carbon tetrachloride at 321K = 1540 kg/ m3
Concentration of carbon tetrachloride
Similarly repeating the experiments at different temperature we get different values for diffusion co-efficient.Thus it is seen that the diffusion coefficient is a function of time and it increases with increase in temperature.
Plot a T vs D*P on a log - log plot.
Finally from the plot we have
where b is a parameter that denotes temperature dependence and theoritically it should lie between 1.5 to 1.8