["< sod > in [ [ glaciology ] ] and [ [ civil engineering ] ],'''stefan's equation'''( or'''stefan's formula''') it describes the dependence of ice - cover thickness depending on the temperature history. it says in particular that the expected ice accretion is proportional to the square root of the number of [ [ degree days ] ] below a freezing. it is named for slovene physicist [ [ joseph stefan ] ]. < eod > < sod > in [ [ glaciology ] ] and [ [ civil systems engineering ] ],'''stefan's equation'''( or'''stefan's formula''') describes the dependence of ice - cover thickness on the temperature cycle history. but it says or in particular that the expected ice accretion is proportional to the square root of the number of [ [ degree in days ] ] below freezing. it is named for austrian physicist [ [ « joseph stefan | josef stefan ] ]. < global eod >"]