The phrase "simple substance" is correct and can be used in written English.
It refers to a basic or fundamental element or component of something. Example: The periodic table categorizes all known elements, from the most complex to the simplest substances.
The simple substance ethylene is a gas composed of molecules with the formula CH2CH2.
How can this simple substance have such a powerful effect on health and longevity?
Wine, then, is basically a simple substance, but the process of producing it for commercial use can be quite complex.
The company's goal isn't to create weird goats; they're merely a means of producing useful quantities of spider silk, a simple substance created eons ago by natural evolution.
Copyright attaches to form of expression, and defendant's own proof, introduced to deluge the court on the issue of access, itself established that there was more than one way of expressing even this simple substance.
On the other hand, our reason also tells us that such a simple substance, if we find it, occupies space; and if it occupies space, that space must be divisible.
The kitchen also recasts simple substances in unexpected forms.
He was probably the first to distinguish between "simple" substances and "compounds".
Equilibrium phase diagrams of simple substances present a tidy enough picture, with well understood fluid and crystalline phases.
In addition, he urged that compounds receive names to denote their constituent parts and that simple substances be given simple names.
In the end, however, the numerical rules for the chemical combination of different simple substances, together with the experiments on the conversion of work into heat by Benjamin Thompson (Count Rumford and James Prescott Joulee, led to the downfall of the theory of caloric.
