Homogeneous mixtures are those mixtures in which the solute particle is completely soluble in the solvent and cannot be separated by any physical method.
Homogeneous mixtures can be of solid and solid, solid and liquid, liquid and gas.
An example of a liquid-gas homogeneous mixture is air because it consists of different gases like, nitrogen, oxygen, argon etc along with water molecules called moisture.
The concentration of water molecules depends upon geographical and climatic conditions.