Specific Heat of Liquid in Convection Formulas

Yes, the Specific Heat of Liquid, measured in Specific Heat Capacity can be negative.

Specific Heat of Liquid is usually measured using the Joule per Kilogram per K[J/(kg*K)] for Specific Heat Capacity. Joule per Kilogram per Celcius[J/(kg*K)], Kilojoule per Kilogram per K[J/(kg*K)], Kilojoule per Kilogram per Celcius[J/(kg*K)] are the few other units in which Specific Heat of Liquid can be measured.