👉 The term "constitutive" refers to the relationship between a material and its properties, such as its electrical resistance or conductivity. Constitutive equations are mathematical models used to describe how materials behave under certain conditions and to predict their behavior in real-world applications. These equations can be derived from experimental data or are developed through numerical simulations of physical phenomena. In physics and engineering, constitutive equations are crucial for predicting the behavior of materials at different temperatures, pressures, and other environmental factors that affect their properties