Thermodynamic temperature in degrees Rankine are converted to kelvins by "dividing" by 1.8 ("T" = "T" ÷ 1.8). Although the kelvin and Celsius scales are defined using absolute zero (0 K) and the triple point of water (273.16 K and 0.01 °C), it is impractical to use this definition at temperatures that are very different from the triple point of water. ITS-90 is then designed to represent the thermodynamic temperature as closely as possible throughout its range. Many different thermometer designs are required to cover the entire range. These include helium vapor pressure thermometers, helium gas thermometers, standard platinum resistance thermometers (known
Absolute Zero (novel) Absolute Zero (novel) Absolute Zero is a 1978 children's novel by Helen Cresswell, the second book in the Bagthorpe Saga. The Bagthorpe Saga follows the lives of the Bagthorpe family, who live in Unicorn House in an unspecified part of the United Kingdom. The nearest large settlement is the (presumably) fictional town of Aysham. Jack Bagthorpe is the protagonist with his dog Zero. Jack's family become involved in entering competitions. Uncle Parker has won a trip to the Caribbean in a caption contest. In typical Bagthorpian style, the rest of the family immediately enter similar competitions in an attempt to