This isn't for a project, but rather an inquiry for my general knowledge as I can't seem to find my answer anywhere online. I am a novice in DIY plumbing(e.g. installed a few sink and tub faucets) so bear with me as I will do my best to explain. I recently moved into a new apartment in Dallas where I noticed that the hot water is immediately overridden by the slightest adjustment of the cold water knob. This isn't just at a particular sink but seems to be all throughout the system including the showers and all. On a separate but maybe related note, it was my understanding that there are two lines, 1 for hot water and 1 for cold. A standard two knob faucet controls each respectively. So theoretically when both knobs are turned on fully, we get maximum volume water flow where the hot and cold water mixes. However what I've noticed with the faucet here is that there seems to be a steady state net outflow regardless of how much each knob may be turned. Is there some sort of volume conservation control mechanism that reduces the flow of one line while increasing the other?