Final answer:
The density of substances can be compared through the graph. Substance X has less mass than Substance Y, and Substance W has less volume than Substance X.
Step-by-step explanation:
The graph compares the density of four different substances. Based on the information from the graph, the best comparison of physical properties of two substances is:
- Substance X has less mass than substance Y.
- Substance W has less volume than substance X.
The graph shows that Substance X has a lower density than Substance Y, indicating that Substance X has less mass for a given volume. Similarly, Substance W has a lower density than Substance X, indicating that Substance W has less volume for the same mass.