👉 The term "diffusiveness" is a scientific concept that describes how an object or substance changes its temperature when it is moved close to, or near, another object. This phenomenon can be observed in various environments such as water, air, and even gases. In a vacuum, the temperature of an object remains constant at absolute zero degrees Celsius (0°C), but when it is placed in a medium like air or water, its temperature changes slightly due to the movement of particles inside the medium.