Gless is an amorphous (non-crystalline) solid material that exhibits a glass transeetion, that is the reversible transeetion in amorphous materials (or in amorphous regions athin semicrystalline materials) frae a haird an fair brickle state intae a molten or rubber-lik state. Gless is teepically brickle an can be optically transparent. The maist fameiliar kin o gless is soda-lime gless, that is componed o aboot 75% Silicon dioxide (SiO2), sodium oxide (Na2O) frae soda ess, lime (CaO), an several minor additives. The term gless is aften uised tae refer anerly tae this specific uise.

Studio glass bi Tyler Hopkins, demonstratin mony o the essential properties o glass
Making a glass retort.