First-order fluid
Okay kiddo, so a first-order fluid is a type of liquid or gas that is pretty simple. It's not too thick or sticky like honey, and it doesn't change its shape too much when you push or pull on it.
You know how when you pour water into a cup, the water stays in the cup and doesn't spill out, right? Well, that's because water is a first-order fluid. It doesn't resist being poured or moved around too much.
Some other things that are first-order fluids are air, cooking oil, and milk. They're all pretty easy to pour or move around because they don't have too much resistance.
Now, there are other types of fluids that are a bit more complex and harder to move around. They're called higher-order fluids, but we'll save that for another day!
You know how when you pour water into a cup, the water stays in the cup and doesn't spill out, right? Well, that's because water is a first-order fluid. It doesn't resist being poured or moved around too much.
Some other things that are first-order fluids are air, cooking oil, and milk. They're all pretty easy to pour or move around because they don't have too much resistance.
Now, there are other types of fluids that are a bit more complex and harder to move around. They're called higher-order fluids, but we'll save that for another day!