What is the outcome when a refrigerant is blended as an azeotrope?

When a refrigerant is blended as an azeotrope, one key characteristic is that the vapor and liquid phases have the same composition. This occurs because azeotropic mixtures behave as a single substance when they change states from liquid to gas or vice versa. As a result, both phases maintain the same ratio of the components in the blend, which is a critical factor in refrigeration systems.

This property is particularly important for ensuring consistent performance in cooling applications. Azeotropic blends do not separate into distinct layers, which allows for predictable and stable refrigerant behavior during phase changes. This stability is crucial for maintaining efficiency and effectiveness in refrigeration systems.

The other options describe behaviors that do not apply to azeotropes; for example, they do not only exist as a liquid form or become more dense in gas form without significant changes in pressure or temperature. The absence of distinct layering further confirms the unique phase properties of azeotropic mixtures.