How can we find specific heat capacity without using heat, $$ c= \dfrac{\delta Q}{m \,\delta T}$$ Calorimeter $$ c_1\cdot m_1\cdot \delta T_1 =c_2\cdot m_2 \cdot \delta T_2 $$ In this formula we can measure mass by balance and temperature with thermometer. But we need one specific heat either $c_1$ or $c_2$ to calculate other material heat capacity.
The question arise how do we know heat capacity of the first material to use as reference, because we can not calculate heat & specific heat capacity directly. How the first time we calculate heat capacity.
Is there any reference material heat capacity to use as relative. Or any statistical calculation or any other?