Intuitively, we should expect B became negative at low temperature, while C would remain positive to counterbalance the effect of B and pushes Z and hence pressure to high values as ρ increases.
直观地，我们期望B在低温下变为负值，而C将保持正值以抵消B的影响，并且因此当ρ增加时，Z及压力都持續增高。