Search results
Results from the WOW.Com Content Network
Evidence of glass during the chalcolithic has been found in Hastinapur, India. [19] The earliest glass item from the Indus Valley civilization is a brown glass bead found at Harappa, dating to 1700 BCE. This makes it the earliest evidence of glass in South Asia. [3] [20] Glass discovered from later sites dating from 600 to 300 BCE displays ...
A glass building facade. Glass is an amorphous (non-crystalline) solid.Because it is often transparent and chemically inert, glass has found widespread practical, technological, and decorative use in window panes, tableware, and optics.
Obsidian talus at Obsidian Dome, California Polished snowflake obsidian, formed through the inclusion of cristobalite crystals. The Natural History by the Roman writer Pliny the Elder includes a few sentences about a volcanic glass called obsidian (lapis obsidianus), discovered in Ethiopia by Obsidius, a Roman explorer.
Known affectionately to scientists as the "boring billion," there was a seemingly endless period in the world's history when the length of a day stayed put. The time when a day on Earth was just ...
From its Indian origins, glass beads spread as far as Africa and Japan, sailing with the monsoon winds, hence their being referred to as 'trade wind beads'. [19] The most common compositional type, representing 40% of the glass finds for the region, is known as mineral soda-alumina glass [20] and is found from the 4th century BC to the 16th ...
The 300-plus-year-old glass onion bottles were discovered from ... 2016 documentary following modern-day treasurer ... Working in retirement could slash your Social Security by $239 per month in ...
Opacity in glass can be due to a number of factors; intensity of colour, bubbles in the glass or the inclusion of opacifying agents, such as tin (SnO 2 & PbSnO 3) and antimony (Ca 2 Sb 2 O 7 & CaSb 2 O 6 & Pb 2 Sb 2 O 7). [12] [11] The main type of glass found in the Anglo-Saxon period is a soda-lime-silica glass, continuing the Roman tradition ...
Indium is a technology-critical element used primarily in the production of flat-panel displays as indium tin oxide (ITO), a transparent and conductive coating applied to glass. [ 15 ] [ 16 ] [ 17 ] Indium is also used in the semiconductor industry , [ 18 ] in low-melting-point metal alloys such as solders and soft-metal high-vacuum seals.