Is sand a better conductor than clay? And why?

[AppeltjeBosheuvel]

I'm reading through my soil heat flux chapter and I have two questions: it seems that

1. Cs (volumetric heat capacity) in soil increases with increasing soil moisture. I assume volumetric heat capacity is the amount of J it takes to heat up a volume with 1 degree. Does that mean that the more water is in a soil, the more J it takes to heat up a volume? Is this correct?

2. It also has a graph of conductivity over soil moisture content, here clay is less of a conductor than sand. Why is this so? Cause clay is less permeable?

I would love some help :) Thank you

 

[litup]

When you say 'conductivity' are you referring to electrical conductivity or heat conductivity? Because if you are talking electrical, sand is basically impure glass and would have a very low electrical conductivity and not much better heat conductivity. Clay, by definition would have a much higher water content and would be a better conductor of electricity AND heat.