| Subject | English | Spanish |
| life.sc. | exchange coefficient | coeficiente de intercambio |
| light. | mutual exchange coefficient between two surfaces S1 and S1, when the radiance or luminance of S1 (or S2) is the same at all points and for all directions | coeficiente de cambio mutuo |
| earth.sc. | mutual exchange coefficient | coeficiente de cambio mutuo |
| el. | self-exchange coefficient | coeficiente de autocambio |