Now, most boaters refer to sacrificial anodes as âzincs,â because zinc has been used for a long time. But there are other âzincsâ made of aluminum, magnesium and various alloys with various trade names.n a hypothetical situation where zinc would last 150 days, magnesium would last but 50 days, while an aluminum anode would have corrosion lined up at the chow line for 225 days.
Although water is also incompressible but it is usually considered a contaminant rather than a hydraulic fluid in systems, but recently students of Purdue university claim to have built a small lawn mower which uses only water in all its hydraulic systems.
You cannot displace matter, most things that can be compressed have a certain amount of air in them, which can be pushed out making it more dense. Water is as dense as it can be because it is a liquid. It can be pressurized like the other people answered, but shocks on a car use the fact that water can be displaced but not compressed to make your car ride smoother. Hope that helps, you can look up thermodynamics of liquids to get a better understanding of how it all works.