Here's where things get fun. Just like the number of reps, 3-6 sets is the best range of volume for this training method. If you like your workouts paced like clockwork, take 30-60 seconds rest between each exercise.
The natural attraction between positive and negative keeps the ions surrounded by water molecules and therefore dissolved in solution. Many biochemicals are either polar molecules or charged ions (or both) so water makes an excellent solvent for them.
Non-polar molecules are neither attracted to nor repelled by each other so the pull between water molecules is much stronger. Hydrophilic molecules attract the water molecules and they blend together, making water a very good solvent in many situations. Uses The hydrophilic properties of certain substances can be of great use in industry, especially in terms of keeping essential areas clean.