Stone Age humans were the first people to discover glass in the form of natural glass, such as obsidian or fulgurites. They used these materials for tools and decorations. Man-made glass wasn't invented until 3500 B.C. by ancient Mesopotamians, Egyptians or Syrians.
Obsidian is natural glass created by the high pressure and heat of volcanoes, while fulgerites are glass formations made from sand superheated by lightning. An ornamental scarab found with Tutankhamun's body was crafted from clear fulgerite glass, likely from the Libyan Desert, that is over 26 million years old. Glass was first used by humans as beads and glazed coatings for pottery, and the Phoenicians transported these goods around the Mediterranean Sea. Hollow glass constructions first appeared in Mesopotamia in the 16th century B.C.Learn More
Most glass takes on a more fluid consistency at temperatures of around 1350 degrees Fahrenheit. At this temperature, glass has the consistency of honey or syrup.Full Answer >
Flattening glass bottles requires the use of a kiln. The bottle must be heated to an extreme temperature and then cooled slowly.Full Answer >
Glass is sometimes called a supercooled liquid because it does not form a crystalline structure, but instead forms an amorphous solid that allows molecules in the material to continue to move. However, Scientific American indicates that amorphous solids are neither supercooled liquids nor solids.Full Answer >
Although it technically depends on the exact molecular makeup of the glass in question, glass typically melts between 2,500 degrees Fahrenheit and 2,900 degrees F (approximately 1,400 - 1,600 degrees Celsius). Certain types of glass can melt at lower temperatures, but commercial glass must reach that approximate temperature before melting.Full Answer >