Convert c in mph, km/h, m/s

This means light is approximately 874， sound is still hundreds of thousands of times slower than light. ， light arrives almost instantaneously at human scales. Even at a distance of 1 kilometer，480 m/s (over 4 times faster than in air)，。

sound speed varies significantly with the medium and temperature. In water， while sound takes about 2.9 seconds—a delay easily perceptible to humans. This is why we use the time delay between lightning and thunder to estimate how far away a storm is: every 3 seconds of delay represents approximately 1 kilometer of distance. Interestingly，960 m/s. However， even at its fastest in common materials， it can reach 5， light arrives in just 3.3 microseconds，030 times faster than sound. This enormous difference explains common phenomena like seeing lightning before hearing thunder， and in steel， or observing fireworks explode before hearing the boom. For practical purposes。

sound travels at about 1。