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Sub-zero literally means "beneath zero". As such, it is usually used for negative numbers ; the most common usage refers to negative temperature . Sub-zero can also refer to:
Zero kelvin (−273.15 °C) is defined as absolute zero.. Absolute zero is the coldest point on the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value.
Because liquid droplets commonly exist in clouds at sub-zero temperatures, 0 °C is better defined as the melting point of ice. In this scale, a temperature difference of 1 degree Celsius is the same as a 1 kelvin increment, but the scale is offset by the temperature at which ice melts (273.15 K).
The weather forecast shows temperatures in the three cities hitting sub-zero on Sunday. Temperatures in several other areas in Henan would plunge to a low of minus 15 C (5 F) over the weekend, the ...
Starting on December 15, she fought through temperatures as low as -4 degrees Fahrenheit (-20 degrees Celsius) and winds as strong as 50 miles per hour (about 80.5 km/h) – moments in which ...
The difference of temperatures between the freezing- and boiling-points of water under standard atmospheric pressure shall be called 100 degrees. (The same increment as the Celsius scale) Thomson's best estimates at the time were that the temperature of freezing water was 273.7 K and the temperature of boiling water was 373.7 K. [33]
Infinite temperature (coldness zero) is shown at the top of the diagram; positive values of coldness/temperature are on the right-hand side, negative values on the left-hand side. Certain systems can achieve negative thermodynamic temperature; that is, their temperature can be expressed as a negative quantity on the Kelvin or Rankine scales.
Sunday morning saw temperatures as low as minus 20 degrees Fahrenheit (minus 6.7 degree Celsius) to minus 40 F (minus 40 c) in northern and northeast Montana. Saco, Montana, dropped to minus 51 F ...