The phrase "a mixture of substances" is correct and usable in written English.
It can be used when describing a combination of different materials or elements, often in scientific or culinary contexts.
Example: "The solution was found to be a mixture of substances that reacted with each other to produce heat."
Alternatives: "a blend of materials" or "a combination of elements."
Phase, in thermodynamics, chemically and physically uniform or homogeneous quantity of matter that can be separated mechanically from a nonhomogeneous mixture and that may consist of a single substance or of a mixture of substances.
Phase diagram, graph showing the limiting conditions for solid, liquid, and gaseous phases of a single substance or of a mixture of substances while undergoing changes in pressure and temperature or in some other combination of variables, such as solubility and temperature.
The rest of cerumen - to give it its technical name - is a mixture of substances.
Moreover, analysed layers are usually a mixture of substances, where the studied substance (for example organic binder) is present as a minor component.
An inhibitor is a material (or a mixture of substances) added in a very low concentration to treat the surface of a metal that is uncovered to a corrosive environment that terminates or diminishes the corrosion of a metal.
The problem is relatively easy when the query spectrum (that is, a spectrum of the substance to be identified) is directly represented in the library, but in general this is not the case, and the query spectrum may come from a mixture of substances that are either individually represented in the library or as a mixture.
Generally, for a mixture of agonistic substances with the same mode of action, the biological signal is higher than for a single substance which makes in vitro assays highly suitable as screening tools for environmental samples.
Most natural food contains a mixture of such substances.
Natural fingerprint residue is composed of a mixture of numerous substances; 99% water and the remaining part consist of small amount of organic and inorganic materials (Girod et al. 2012).
Ploeger and Chiantore do not specify the type of "phthalate plasticiser" found in their samples, but the presence of these phthalate plasticiser matches strongly suggest that the interior upholstery samples, while likely consisting of a mixture of different substances, contain the types of compounds which would be present in an alkyd coating.
At present, two types of binary systems exist in the market: the organic Rankine cycle (ORC) which uses organic working fluids (e.g. propane or isobutane) and the Kalina Cycle which uses a mixture of two substances as the working fluid (e.g. water and ammonia).
