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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.
Temperatures measured with equipment calibrated per ITS-90 may be expressed using any temperature scale such as Celsius, Kelvin, Fahrenheit, or Rankine. For example, a temperature can be measured using equipment calibrated to the kelvin-based ITS-90 standard, and that value may then be converted to, and expressed as, a value on the Fahrenheit ...
The theoretical temperature is determined by extrapolating the ideal gas law; by international agreement, absolute zero is taken as 0 kelvin (International System of Units), which is −273.15 degrees on the Celsius scale, [1] [2] and equals −459.67 degrees on the Fahrenheit scale (United States customary units or imperial units). [3]
A Assuming an altitude of 194 metres above mean sea level (the worldwide median altitude of human habitation), an indoor temperature of 23 °C, a dewpoint of 9 °C (40.85% relative humidity), and 760 mmHg sea level–corrected barometric pressure (molar water vapor content = 1.16%).
Liquid helium is a physical state of helium at very low temperatures at standard atmospheric pressures.Liquid helium may show superfluidity.. At standard pressure, the chemical element helium exists in a liquid form only at the extremely low temperature of −269 °C (−452.20 °F; 4.15 K).
Kelvin Celsius Fahrenheit Rankine; Absolute zero [A] 0 K −273.15 °C −459.67 °F 0 °R Boiling point of liquid nitrogen: 77.4 K −195.8 °C [20] −320.4 °F 139.3 °R Sublimation point of dry ice: 195.1 K −78 °C −108.4 °F 351.2 °R Intersection of Celsius and Fahrenheit scales [A] 233.15 K −40 °C −40 °F 419.67 °R
Kelvin Celsius Fahrenheit; 1 H hydrogen (H 2) use: 20.271 K: −252.879 °C: ... For the equivalent in degrees Fahrenheit °F, see: Boiling points of the elements ...
The SI unit for absolute temperature, T, is the kelvin (K). To find the total power , P {\displaystyle P} , radiated from an object, multiply the radiant exitance by the object's surface area, A {\displaystyle A} : P = A ⋅ M = A ε σ T 4 . {\displaystyle P=A\cdot M=A\,\varepsilon \,\sigma \,T^{4}.}