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  2. Why Minus 40 Is A Magical Number In Weather - AOL

    www.aol.com/news/why-minus-40-magical-number...

    But there's one number in meteorology that lines up exactly between Fahrenheit and Celsius: minus 40 degrees! When the actual temperature dips down to minus 40, ...

  3. Fahrenheit - Wikipedia

    en.wikipedia.org/wiki/Fahrenheit

    With the Fahrenheit and Celsius scales now both defined by the kelvin, this relationship was preserved, a temperature interval of 1 °F being equal to an interval of 5 ⁄ 9 K and of 5 ⁄ 9 °C. The Fahrenheit and Celsius scales intersect numerically at −40 in the respective unit (i.e., −40 °F ≘ −40 °C). Absolute zero is 0 K, −273. ...

  4. Extreme cold grips Nordic countries, Russia as floods hit ...

    www.aol.com/news/extreme-cold-grips-nordics...

    Temperatures fell below minus 40 degrees Celsius (minus 40 degrees Fahrenheit) in the Nordic region for a second day in a row Wednesday. In Kvikkjokk-Årrenjarka in Swedish Lapland, the mercury ...

  5. Negative temperature - Wikipedia

    en.wikipedia.org/wiki/Negative_temperature

    This should be distinguished from temperatures expressed as negative numbers on non-thermodynamic Celsius or Fahrenheit scales, which are nevertheless higher than absolute zero. A system with a truly negative temperature on the Kelvin scale is hotter than any system with a positive temperature. If a negative-temperature system and a positive ...

  6. Cold spell in Finland and Sweden sends temperature below minus 40

    www.aol.com/news/finland-sweden-set-winters-cold...

    Finland and Sweden recorded their coldest temperatures of the winter Tuesday when thermometers plummeted as low as minus 40 degrees Celsius (minus 40 Fahrenheit) as a cold spell grips the Nordic ...

  7. Degree of frost - Wikipedia

    en.wikipedia.org/wiki/Degree_of_frost

    "Degree" in this case can refer to degree Celsius or degree Fahrenheit. When based on Celsius, 0 degrees of frost is the same as 0 °C, and any other value is simply the negative of the Celsius temperature. When based on Fahrenheit, 0 degrees of frost is equal to 32 °F. Conversion formulas: T [degrees of frost] = 32 °F − T [°F]

  8. Bundle up, it’s going to feel like minus 40 once the coldest ...

    www.aol.com/bundle-going-feel-minus-40-135413897...

    Monday will likely be the coldest day of the season so far for Dallas with the high temperature only climbing a few degrees above freezing. It’ll also be Chicago’s coldest day of the year with ...

  9. Conversion of scales of temperature - Wikipedia

    en.wikipedia.org/wiki/Conversion_of_scales_of...

    * Normal human body temperature is 36.8 °C ±0.7 °C, or 98.2 °F ±1.3 °F. The commonly given value 98.6 °F is simply the exact conversion of the nineteenth-century German standard of 37 °C. Since it does not list an acceptable range, it could therefore be said to have excess (invalid) precision.