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A degree of frost is a non-standard unit of measure for air temperature meaning degrees below melting point (also known as "freezing point") of water (0 degrees Celsius or 32 degrees Fahrenheit). "Degree" in this case can refer to degree Celsius or 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, the conversion is a bit more complicated, as 0 degrees of frost is equal to 32°F. Conversion formulas: * T (of frost ) = 32°F - T () * T () = 32°F - T (degrees of frost) The term "degrees of frost" was widely used in accounts of the Heroic Age of Antarctic Exploration in the early 20th century. The term appears frequently in Ernest Shackleton's books ''South'' and ''Heart of the Antarctic'', Apsley Cherry-Garrard's account of his Antarctic adventures in ''The Worst Journey in the World'' (wherein he recorded 109.5 (Fahrenheit) degrees of frost, –77.5 °F or –60.8 °C), as well as Admiral Richard E. Byrd's book ''Alone.'' ==References== 〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Degree of frost」の詳細全文を読む スポンサード リンク
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