Zhubov scale

{{short description|Scale for reporting polar sea ice coverage}}

The Zhubov scale is a way of reporting polar sea ice coverage.{{cite book | last=Joseph | first=Christopher | title=How to Measure Anything | publisher=Ivy Press | publication-place=London | page=40 | date=2022-04-12 | isbn=978-0-7112-6803-6 }}{{cite book | last=Jerrard | first=H. G. | title=A Dictionary of Scientific Units | publisher=Springer Science & Business Media | date=2013-03-09 | isbn=978-94-017-0571-4 | page=165}}

It was developed in the former USSR by Russian naval officer N. N. Zhubov (1895–1960) as a way for Soviet officers to describe ice coverage.{{cite book | last=Fairhall | first=David | title=Russian Sea Power | publisher=Boston : Gambit | publication-place=Boston | page=37 | date=1971 | isbn=978-0-87645-040-6}}{{cite book | last=Gyllenbok | first=Jan | title=Encyclopaedia of Historical Metrology, Weights, and Measures | publisher=Birkhäuser | publication-place=Cham | page=237 | date=2018-04-11 | isbn=978-3-319-57598-8}}

The Zhubov scale is measured by using the unit ball, one ball equals 10% coverage, five balls 50% coverage and so on, with a total of ten unit balls being possible.