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Q: Why do you always see lightning first and then hear thunder?
The scientific answer is that lightning occurs at the same time, which is a discharge phenomenon between clouds with different charges or between clouds and the earth. When the distance between clouds with different charges is reduced to a certain distance due to movement, the strong potential difference between positive and negative charges will break through the air and cause instantaneous discharge. The discharge spark produced during discharge is the lightning we see, and the sound produced during discharge is thunder.
Similarly, when charged clouds move, induced charges will be generated at the corresponding places on the ground. If the distance between the cloud and the ground or a tall object on the ground is small, the air between the cloud and the object is decomposed and lightning is generated by instantaneous discharge.
We see lightning first and then hear thunder, so the speed of light is much faster than the speed of sound, so we see lightning first and then hear thunder.
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