For the curious:  "In 2015, Laso Schaller broke the cliff jumping world record. He jumped 58.8m (192ft) off the Cascata del Salto in Switzerland, reaching an eye-watering 76.4mph (122.31kmh) in the moments before he hit the water. ",(reply>), @astrojeff You put enough pressure to something, it turns into a liquid. Whether that matter used to be solid or gas, compressive force will turn it into a liquid. Now. Concrete is more dense than water, but it can be compressed. What we're looking at here is not density and comparing those, we're looking at the percentage change in density in the material when compressive force is applied. <br>Concrete has a compressive strength, in other people have calculated the amount concrete compresses under pressure and put it into a formula that tells them when it compresses under pressure and how much. Liquids do not have a compressive strength as any compression is on such a small scale to be next to immeasurable.<br><br>I don't know about the whole water harder than concrete bit. Harder is still a really weird word without a direct term in physics to compare it to.,(reply>), @Gabriel Ståhl But if you're (the pilot) in a small plane too much fear of the ground can be just as dangerous..   😱😅⛽⏳😭⌛☠😇,(reply>), @ShloKing I was replying to your statement, “water is incompressible. Concrete can certainly be compressed” and wondering whether this is why water is “harder than concrete” at higher impacts. I studied engineering and understand the difference between gasses and liquids/solids, that the latter are much less compressible than the former. But I was skeptical of your claim that seems to indicate that concrete is more compressible than water, or that concrete IS compressible and water isnt. Either your statement wasn’t clear (hence all the people commenting), or you need to explain why concrete would be more compressible than water, rather than explaining what we already know, that solids and liquids are less compressible than gases.,(reply>), @astrojeff Already cited sources stating that the whole point of differentiating between gases and liquids (because both are considered fluids) is that gases compress, liquids do not. This is in fluid mechanics textbooks, on national geological survey sites, on Wikipedia pages about thermodynamics, etc.<br>Of course according to non-classical physics such as quantum mechanics, everything is compressible. However for the sake of 99.999% of applications... Assume liquids are incompressible. This is why hydraulics work, this is a fundamental law, liquids exist due to pressure and the whole point is that a material is compressed until it turns into a flowy liquid mass that is as compressed as it can get (without assuming stupidly extreme temperatures or pressures where the normal laws of physics don't apply anyways) minus extremely negligible change that's barely even measurable on the scale of thousandths of a percent changes in density.<br><br>To make your statement correct every solid and GAS is compressible. One of the defining traits of a liquid, again, according to fluid mechanics, is incompressiblity.,(reply>), @Sambenmoser If you're going terminal velocity then yes, water simply can't shift out of the way fast enough, now matter how perfectly you dive. But it's less that and more the matter of when you fall unconscious from initial injuries or the pain, you'll drown. Hell, if you're unconscious you can drown in a puddle if it's deep enough.