A unit of measurement to express the departure of the mean temperature for a day from a given References (or base) temperature. The Freezing Index and the Thawing Index are expressed in degree-days wi
th respect to a References temperature of 0C (32F); units: degree-day Celsius or degree-day Fahrenheit.
1. The total degree of saturation of frozen soil is the ratio of the volume of ice and unfrozen water in the soil pores to the volume of the pores; 2. The degree of saturation of frozen soil by ice is
the ratio of the volume of ice in the soil pores to the volume of the pores.
In England, the number of Fahrenheit degrees that the temperature falls below the freezing point. Thus a day with a minimum temperature of 27F may be designated as a day of five degrees of frost.
The removal of ice deposited on any object, especially applied to aircraft icing. Principal methods of de-icing in use today are heating, chemical treatment, and mechanical rupture of the ice deposit.