helium-4

Helium-4 is a stable isotope of the element helium, consisting of two protons and two neutrons in its nucleus. It is well-known for its low boiling point, making it the second lightest and second most abundant element in the universe. Helium-4 is used in various applications, such as cooling superconducting magnets in MRI machines and scientific research, because it remains liquid at extremely low temperatures. Its inert, non-reactive nature and unique quantum properties, like superfluidity at very low temperatures, make it valuable in both technological and scientific fields.