Liquid Helium is a state of helium gas that occurs at extremely low temperatures, specifically below -269 degrees Celsius (-452 degrees Fahrenheit). In this liquid form, helium exhibits unique properties, such as being the coldest liquid known and having the ability to flow without viscosity, making it a superfluid. This superfluidity allows liquid helium to climb up and over the sides of containers, defying gravity. It is commonly used in scientific research, particularly in cryogenics, where it cools superconducting magnets and other equipment to maintain low temperatures necessary for various experiments.