SI unit造句怎么写

"The density of the lines indicates the magnitude of the field, the lines Being crowded together where the magnetic field is strong. The SI unit for magnetic flux is the weber. "

the force applied to a unit area of surface; measured in pascals (SI unit) or in dynes (cgs unit).

The SI unit of magnetic flux equal to the magnetic flux that in linking a circuit of one turn produces in it an electromotive force of one volt as it is uniformly reduced to zero within one second.