I'm writing an essay for school on ferrofluids, and I have a question about it, maybe you can help me.
In quite a few articles, i find the formula ρ=(Ve^-B^2)+p
ρ as resistance in Ohm
V as the vollema value
B as the strength of the magnetic field in Tesla
p as the pietrow constant.
The question I have: what is the vollema value, and how can I determine this value?