At this moment there are no hydraulic piping stand- ards available which cover different pressure classes and piping materials as well as being gener- ally suited for all applications.
A high concentration simply means there is a high percentage of solute particles dissolved in the solvent and the solution is said to be concentrated. And a low concentration means there is not a high percentage of solute particles in the solvent and the solution is said to be diluted. high concentration of something, like a hormone in the blood, means there is a lot of it. A low concentration of something means there is not a lot of it, but a little.
That is because the solution is saturated. That means no more solute will dissolve into it. Concentration is the amount of material that is dissolved. If you put one teaspoon of salt in a glass of water, it has a low concentration. If you put 10 teaspoons of salt in the same glass of water, it has a high concentration.