Liquid helium physicist Richard Feynman. Liquid helium At standard pressure, the chemical element helium exists in a liquid form only at the extremely low temperature of −270 °C (about 4 K or −452.2 °F). Its boiling point and critical point depend on which isotope of helium is present: the common isotope helium-4 or the rare isotope helium-3. These are the only two stable isotopes of helium. See the table below for the values of these physical quantities. The density of liquid helium-4 at its boiling point and a pressure of one atmosphere (101.3 kilopascals) is about 0.125 grams per cm, or about
Boiling Point (1998 miniseries) tells Ramsay there are no new three stars. Boiling Point (1998 miniseries) Boiling Point is a five-part, 1999 Channel 4 documentary miniseries produced by Tim Graham and David Nath for London Weekend Television (LWT) and following Chef Gordon Ramsay. With each segment 30 minutes in length, the series was broadcast 25 February 1999 – 25 March 1999. Chef Ramsay is closely followed during eight of the most intense months of his life as he opens his first (and now flagship) restaurant in Royal Hospital Road in Chelsea in September 1998. This establishment would ultimately earn him the highly prestigious (and