help me in chemWatch
basically in organisms like humans water is used to move things around. you probably know osmosis and for it to happen there needs to be a concentration gradient and that occurs because of different pressures which refers to the hydraulics
the thing is most molecules are water soluble ie carbohydrates can dissolve in water so that affects the water potential (pressure created by water molecules (A Level)) so water moves via the water potential gradient via osmosis. if water could be compressed then pressure (more molecules in a given unit of volume) would change but it wouldnt affect anything 'basically' because I cant give a full explanation lol :-; hoped this helped though .
summary. what you are saying happens when water is normal like right now (uncompressed)
either way you don't need to fully understand it you just need to know it in the exam. unless it says so in the specification