There are many more examples. Note that measuring each of these properties will not alter the basic nature of the substance. Examples of chemical properties are: heat of combustion, reactivity with water, PH, and electromotive force.
Mathematical fonts. In mathematical mode you can change the typefaces of the fonts when needed. For instance, it's customary to represent real numbers with a blackboard bold font, or topological spaces with calligraphic font. This article shows several fonts in math mode.
Font styles. Most fonts have various styles within the same family, typically a bold and an italic one, often also a bold italic style, somewhat less often a small-caps and in a few cases extra-light/extra-bold or stretched/condensed versions. The table below shows a number of different styles.