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| English | Russian |
| 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 a unit time | за единицу времени |
| per unit time | на единицу времени |
| per unit time | за единицу времени |
| the distance per unit time | путь, пройденный за единицу времени |
| the quantity of solar radiation received... on a unit of surface in a unit of time is called the solar constant | на единицу поверхности |
| unit of time | такт |
| unit of time pass | такт |