When a liquid is dissolved in another liquid, this is known as what?

When a liquid is dissolved in another liquid, the correct term to describe this process is a solution. A solution is a homogeneous mixture where one substance (the solute) is completely dissolved in another substance (the solvent). In this case, when one liquid dissolves into another liquid, the result is a clear and uniform mixture where the solute cannot be distinguished from the solvent.

While the terms emulsion and suspension also relate to mixtures, they describe different types of systems. An emulsion specifically refers to a mixture of two immiscible liquids, such as oil and water, where one is dispersed in the other but not fully dissolved. A suspension, on the other hand, is a heterogeneous mixture where solid particles are dispersed throughout a liquid but are not completely dissolved, often resulting in cloudiness.

Therefore, the correct terminology when one liquid is completely dissolved in another is indeed a solution, not an emulsion or a suspension.