Loudness is more complicated than that: waves of the same height can be perceived as different volumes.
The latest version of audacity has “loudness normalization” which can make audios equally loud… https://manual.audacityteam.org/man/lou > … ation.html
Okay the waves are different sentences. What I want to do is making the words of a sentense to the same volume if that’s the right word for it. So “I am happy” having the exact same volume.