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) participation in the dinner made at the Palace of Versailles on 11 July 1998 to celebrate the closing of the 1998 World Cup and features young chefs Marcus Wareing and Mark Sargeant at the early stages of their careers, as well as mentor Marco Pierre White. "Boiling Point" was the first mass exposure of Ramsay to television audiences, revealing his highly driven, impatient and hot tempered personality which has become his trademark. The series was followed-up in 2000 by a six-part LWT miniseries, "Beyond Boiling Point", again produced by Graham (this time with Paul Denchfield and Lucy Leveugle) for LWT,