Final answer:
The physical properties of a substance—mass, density, color, refractive index, and boiling point—remain the same when it changes from solid to liquid at one atmosphere.
Step-by-step explanation:
The statement refers to the physical properties of a substance that remain consistent when it changes state from solid to liquid at one atmosphere. These properties include the substance's mass, density, color, refractive index, and boiling point, all of which do not change when transitioning between solid and liquid forms at constant pressure. In contrast, volume and shape are not typically the same because liquids do not have a definite shape like solids do.
In the liquid state (at one atmosphere), a substance's temperature, pressure, density, composition, and enthalpy (heat content) will also be the same. This assumes that the substance is in a state of equilibrium under the specified conditions. In a phase change from gas to liquid or vice versa at a given temperature and pressure, these properties remain constant. The behavior is in accordance with the phase rule, which describes the relationships between the number of phases, components, and degrees of freedom in a system at equilibrium.