Temperature is a physical quantity that expresses the degree of heat or cold in a substance, system, or environment. It reflects the average kinetic energy of the particles (atoms or molecules) within an object or substance. A higher temperature means the particles are moving more rapidly, while a lower temperature means they are moving more slowly.
Temperature is measured in units such as Celsius (°C), Fahrenheit (°F), and Kelvin (K). It plays a critical role in various natural processes, scientific studies, and everyday applications.