Sometimes, in thunderstorm weather, we only see lightning and can't hear thunder, because

Lightning and thunder should be equidistant and occur simultaneously. The spread of lightning should be the spread of light, and the spread of thunder should be the spread of sound. Light travels very fast, but sound travels very slowly, so generally speaking, lightning is seen first, and then thunder is heard. Just like when fireworks are set off, the first thing you see is flowers and the second thing you hear is guns. For the same distance, the faster the speed, the shorter the time. Sometimes lightning just flashes, and then thunder rings, indicating that the minefield is around or overhead. If you are in the rain, you should be careful. As for seeing lightning but not hearing thunder, generally speaking, the minefield is too far away from the people concerned. Although the light passed, the sound was blocked by various factors and disappeared before reaching the eardrum. So I only saw lightning, but I didn't hear thunder. You can do a small experiment when it rains. When you see lightning, hold the stopwatch and see how long it will be before the thunder starts. Multiply this time by the speed of sound, and you can roughly calculate how far the minefield is from you.