例文
- The discovery of this relationship started in 1855, when Wilhelm Eduard Weber and Rudolf Kohlrausch determined that there was a quantity related to electricity and magnetism, " the ratio of the absolute electromagnetic unit of charge to the absolute electrostatic unit of charge " ( in modern language, the value 1 / \ sqrt { \ mu _ 0 \ varepsilon _ 0 } ), and determined that it should have units of velocity.
