An example of a homogeneous mixture is

A homogeneous mixture is a combination of substances that appears uniform throughout, meaning that the different components are not distinguishable from one another. In the case of flue gas, it refers to the gases that are emitted when fuel is burned, which typically consists of a mixture of carbon dioxide, water vapor, nitrogen, oxygen, and sometimes other gases depending on the fuel being burned and the combustion conditions. The components of flue gas are thoroughly mixed at a molecular level, resulting in a uniform composition that cannot be visually separated, which aligns with the definition of a homogeneous mixture.

In contrast, an emulsion is a type of mixture that typically consists of two immiscible liquids (like oil and water) where one liquid does not dissolve in the other but is dispersed throughout it, creating a heterogeneous system. Sand and water form a suspension, where the sand settles at the bottom, showcasing distinct layers, hence it is not homogeneous. Soda water, although it may seem homogeneous at first glance, contains dissolved carbon dioxide that creates bubbles, which can lead to separation between the gas and liquid over time, reflecting characteristics of a heterogeneous mixture.