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.
The substances dissolved in the solution are called solutes. The concentration of a solution is the mass of solute in a given volume of solution, or mass/volume. For example, if you dissolved 12 grams of salt in 3 liters of water, the concentration of the solution would be 12 g/3 L, or 4 g/L (grams per liter).