Description
The speed of sound in air is around 768 mi/hr (1,125 ft/sec, 343 m/sec), or about 5 seconds per mile, or 3 seconds per kilometer. That is the reason for the rule of thumb where when you see a flash of lightning, count the …
Information of Measurement, Equipment, Mechanical, Electrical & Control
Information of Measurement, Equipment, Mechanical, Electrical & Control
