What are a liquid and a solid with the same density?
If you fill up a cup with water and add ice, what happens to the ice? It floats to the top meaning that water has a greater density. One of the properties of water is that its volume increases when you freeze it, that’s why if you put a glass bottle filled with water in the freezer, the bottle would break. This is caused by the hydrogen bonds. The formula for density is density = mass/volume so if the volume changes, they don’t have the same density. If a solid and a liquid have the same density, the solid will be suspended in the middle of the liquid. You can try experimenting with some different things. Use vegetable oil and a tooth pick or salt water and a tooth pick. If you make a mixture of salt and water, be sure to write down how much water you start with and how much salt you add. The more salt you add, the higher the density will be.
