Color, reflectivity, and hardness are physical properties primarily used to classify substances in the solid state. While these properties can also be relevant for liquids and sometimes for gases (in certain contexts, like color), they are most distinctly characteristic of solids. Therefore, the best answer would be solid.
Color, reflectivity, and hardness are physical properties used to classify substances in which state?
gas
solid
liquid
all states of matter
1 answer