> show the court that my vessel is correct. There isn't always a "correct" in any way you can prove. Often you just have norms. If someone heats the vessel up

> show the court that my vessel is correct. There isn't always a "correct" in any way you can prove. Often you just have norms. If someone heats the vessel up to an arbitrary temperature X, and it explodes, yet the standard which everyone except you followed said it must withstand arbitrary temperature Y, then the court may be inclined to ignore your arguments that temperature X was good enough. Rather than being something you can derive from nature, laws and standards often contain arbitrary values which take into account margins for human error or other "reasonable" measures. In this way, norms gain legal power.