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. Each family has its own font characteristics (such as italic and bold), also known as font styles, or font properties. Font styles are usually implemented with different font files. So it is possible to build a new font family by specifying the font styles of different font families.