 |
Absolute zero is the lowest temperature theoretically possible according to kinetic theory, denoted as zero kelvin (0 K), equivalent to -273.15°C/-459.67°F. At this temperature, molecules are in their lowest possible energy state. The third law of thermodynamics indicates the impossibility of reaching absolute zero, but in practice, temperatures slightly above absolute zero have been achieved, with some reaching temperatures less than a billionth of a degree above it.
Near absolute zero, the physical properties of some materials undergo substantial changes. For example, certain metals lose their electrical resistance and exhibit superconducting behavior. This phenomenon, known as superconductivity, allows for the efficient transmission of electrical currents without any loss of energy. The study of materials and phenomena near absolute zero has led to fascinating discoveries and insights into the behavior of matter at extremely low temperatures.