It sorta depends on the ingredients you’re working with, some tomatoes are sweeter or more acidic than others. Where I live tomatoes tend to be somewhat watery and lack a bit of intensity of flavour. If I’m making sauce at home I’ll taste a bit and add some sugar and/or red wine vinegar to balance out the flavour.
Bernoulli’s principle is certainly involved, but the full explanation is more complicated and arguably beyond high school level: