structural:expansion, stylistic:tone
Miscibility is the property of two substances to mix in all proportions, forming a homogeneous mixture. Such substances are said to be miscible. The term is most often applied to liquids but also applies to solids and gases. An example in liquids is the miscibility of water and ethanol as they mix in all proportions. By contrast, substances are said to be immiscible if the mixture does not form a solution for certain proportions. For one example, oil is not soluble in water, so these two solvents are immiscible. As another example, butanone is significantly soluble in water, but these two solvents are also immiscible because in some proportions the mixture will separate into two phases.