To determine which layer of liquid has a medium density, you would compare the densities of the items you listed.
In a typical density experiment where liquids form layers, the denser liquids settle at the bottom while the less dense ones float on top. Here's a general idea of the densities for the items you've mentioned (from lower to higher density):
- Ping Pong Ball - very low density (floats)
- Dish Soap - medium density
- Rubbing Alcohol - lower density than water
- Vegetable Oil - lower than water
- Soda Cap - varies, but usually low density
- Cherry Tomato - variable density, but generally medium
- Beads - usually low density but can vary
- Water - standard medium density (1 g/cm³)
- Milk - medium density (slightly denser than water)
- 100% Maple Syrup - higher density than water
- Honey - higher density than water
- Popcorn Kernel - low to medium depending on moisture
- Lamp Oil - low density
- Bolt - very high density
Based on this comparison, the liquids with medium densities in your list likely include Dish Soap, Water, or Milk. However, the simplest conclusion is that water is often considered the reference point for medium density, and many other liquids will either float or sink in comparison to it.
If you are particularly looking for an item that would float on water but is denser than some of the lighter items, dish soap might be a good candidate as it has a medium density relative to other liquids in your list.
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