Double-paned windows have two parallel panes (slabs of glass) with a separation of usually about 1 cm; this house is permanently sealed and stuffed at the time of manufacture with dry air or other dry nonreactive fuel. Such windows present a marked improvement in thermal insulation (and normally in acoustic insulation as well) and are immune to fogging and frosting brought on by temperature differential. They are extensively used for residential and commercial building in intemperate climates. Triple-paned windows have been commercially manufactured and marketed with claims of additional benefit but haven’t become frequent.
Namely, in Alexandria ca. 100 AD forged glass home windows, albeit with poor optical properties, began appearing, however these were small thick productions, little more than blown glass jars (cylindrical shapes) flattened out into sheets with round striation patterns throughout. It could be over a millennium earlier than a window glass turned transparent enough to see … Read More