Humours are a genus summum elementalis distinct for its variety in physical states; it is the only one with elements in all 3 states, as well as having the only elements capable of changing between such states (alzayt, alcohol, bromine, water and kerosene).
Humours are almost all liquid or gas, but most can change between these two states with variations in temperature. Some (vide supra but also a few others, like phlegm) can freeze into ice, solid forms. In all cases, gas is hotter than liquid which is hotter than solid. Conductivity varies extremelly with species and it is impossible to generalize most of it. Gas humours, however, are mostly good conductors of odour and radiation.