| 单词 | Table V-1: Electromagnetic Signal Propagation Velocity (Approximate) |
| 释义 | Table V-1: Electromagnetic Signal Propagation Velocity (Approximate) Medium Signal Velocity (km/s) Velocity of Propagation (Vp) Vacuum 300,000 100.00 Air 299,890 99.97 Copper Cable 180,000–240,000 60.00–80.00 Water 226,000 75.33 Teflon |