Immiscible Liquids
Immiscible Liquids is what happens when two liquids, like oil and water, refuse to mix and instead form separate layers.
Think of it this way
Oil and water in a salad dressing jar show exactly how immiscible liquids work. Pour oil and vinegar together, shake hard, and watch what happens. Within a minute, the oil floats back to the top in a clear layer, while the vinegar sinks to the bottom. The oil and water molecules do not bond with each other, so they always pull apart into separate layers.
Explaining immiscible liquids by grade level
When you pour oil into water, something strange happens. The oil floats on top and stays there. No matter how much you stir, the oil and water pull apart again. They do not want to blend together. The oil always finds its way back to the top, sitting in its own layer.