Temperature is a fundamental physical property that quantifies the degree of hotness or coldness of a substance, fundamentally representing the average kinetic energy of the particles within a system. In physical sciences, it is a measure of the energy transferred through conduction, convection, or radiation, with temperature gradients driving heat flow toward thermal equilibrium. In biology, temperature plays a critical role in maintaining homeostasis, where organisms must regulate core body temperature within narrow limits to ensure metabolic function. Technically, temperature is measured using various instruments designed to detect this energy state, often standardized through scale systems based on measurable physical constants, allowing for scientific study across diverse fields from thermodynamics to biochemistry.