Terms for subject Mathematics containing in units of

English	Russian
function expressed in units of stresses	размерность (имеющая размерность напряжений функция)
in a unit of time	за единицу времени (the quantity of solar radiation received... on a unit of surface in a unit of time is called the solar constant)
in the degree measure, the unit of measurement is a degree	единица меры
in units of	в единицах
the fundamental unit of mass in the metric system is the gram	основная единица массы
the quantity of solar radiation received... on a unit of surface in a unit of time is called the solar constant	на единицу поверхности