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.
Definition. Complete set of all characters that comprise a given typeface in a specific point size: capital (uppercase) letters, common (lowercase) letters, small caps, numbers, and mathematical and other symbols. See also bit-mapped font, outline font, and truetype font. Also called font.