Glass is an amorphous (non-crystalline) solid material that exhibits a glass transition,
which is the reversible transition in amorphous materials (or in
amorphous regions within semicrystalline materials) from a hard and
relatively brittle state into a molten or rubber-like state. Glasses are
typically brittle and can be optically transparent. The most familiar type of glass is soda-lime glass, which is composed of about 75% silicon dioxide (SiO2), sodium oxide (Na2O) from soda ash, lime (CaO), and several minor additives. The term glass is often used to refer only to this specific use.