Question: how much thermal energy does it take to raise the temperature of 2.5 kg?
Answer: Heat Capacity for 2.5 kg of Water = (2.5 kg)x(4200 J/kgC) = 10,500 J/C Heat Capacity for 1.5 kg of Lead = (1.5 kg)x(128 J/kgC) = 192 J/C The water will require more than 50 times the energy to raise its temperature the same amount. Q is Thermal Energy is Energy so it has the units of Joules.