Yeah but red ice is obviously red, and obviously ice. I'm talking about an SCP which is water, looks like water, but if you jump in you can't "break" out again.
No one really gave examples, but hard sci fi works within our understanding of physics. It's realistic, e.g. when people go to space they put on a space suit, climb into a rocket, and launch like how they would in real life.
Soft sci fi can ignore physics. Think of star trek or star wars, where the ship gently lifts off the ground and flies up into space, no gforce issues and no trouble just chilling in the sky without falling to earth. Their ship has gravity in space, they can turn sharply and no one feels it, and if they want go go somewhere far away they just warp there. Ships often run on magic crystals. None of that is realistic based on our current physics knowledge, so it's soft sci fi not hard sci fi.
Hard sci-fi is when writers take time to understand current science and understanding how things would work, and then apply it to the future. Arthur C. Clarke is the default example of hard sci-fi.
Basically, "hard" sci-fi uses real world science to figure out how something would work in a future setting. And hard sci-fi really tries to figure out if something is practical outside of a set piece. "Soft" sci-fi is more about social problems of the real world and beyond, like Star Trek. But there isn't an exact formal definition for where hard starts and soft begins, and vice versa.
And I think 95% of scifi fans would agree that neither is better or worse, it just fits the story as its needed. Personally I love hard scifi as a concept, but my favorite scifi stories are all soft, like Star Trek.
"Hard" science fiction usually means that the futuristic concepts and fancy technology are based on (and limited) by our current understanding of the physical universe - if you had enough engineering ability, you could actually do the things presented in the story. This is in contrast to things like Star Wars and Star Trek, where the things they're able to do are basically fantasy dressed up with a technological skin.
I feel like the water I already had inside would keep the control and not betray me seeing new, evil water joining. It just wouldn't go down like that.
That's not a what if, it's a when. Might not happen suddenly, but our air quality and ability to breathe it is going down fast the longer pollution reigns supreme.
Air becoming a luxury is a real threat that money owners happily ignore.