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Glass

Glass is one of the oldest and most versatile materials known to man through  ages. Glass occurs naturally as a volcanic ash 🌋 known as obsidian. Artificial glass was first made about 4000 years ago. The term glass is normally used to describe a particular state of matter, known as glassy or vitreous State, which is obtainable when a liquid cools without crystallization taking place, With solid properties characterized by its brittleness, hardness, transparency and chemical inertness.

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