Search results
Results From The WOW.Com Content Network
Cut glass wine glass made of lead glass. Lead glass, commonly called crystal, is a variety of glass in which lead replaces the calcium content of a typical potash glass. [1] Lead glass contains typically 18–40% (by mass) lead(II) oxide (PbO), while modern lead crystal, historically also known as flint glass due to the original silica source, contains a minimum of 24% PbO. [2]
Lead's close-packed face-centered cubic structure and high atomic weight result in a density [24] of 11.34 g/cm 3, which is greater than that of common metals such as iron (7.87 g/cm 3), copper (8.93 g/cm 3), and zinc (7.14 g/cm 3). [25] This density is the origin of the idiom to go over like a lead balloon.
Lead exposure accounts for about 0.2% of all deaths and 0.6% of disability adjusted life years globally. [248] Although regulation reducing lead in products has greatly reduced exposure in the developed world since the 1970s, lead is still allowed in products in many developing countries. [57]
Leaded glass may refer to: Lead glass , potassium silicate glass which has been impregnated with a small amount of lead oxide in its fabrication Lead came glasswork , glass panels made by combining multiple small pieces of glass, which may be stained, textured or beveled, with cames or copper foil
The Latin for lead is plumbum. Roman roofs used lead in conduits and drain pipes [14] and some were also covered with lead. Lead was also used for piping and for making baths. [15] Plumbing reached its early apex in ancient Rome, which saw the introduction of expansive systems of aqueducts, tile wastewater removal, and widespread use of lead pipes.
2 Pb(NO 3) 2 → 2 PbO + 4 NO 2 + O 2 PbCO 3 → PbO + CO 2. PbO is produced on a large scale as an intermediate product in refining raw lead ores into metallic lead. The usual lead ore is galena (lead(II) sulfide). At a temperature of around 1,000 °C (1,800 °F) in air, the sulfide converted to the oxide: [4] 2 PbS + 2 O 2 → 2 PbO + 2 SO 2
Stiegel's works was the first to make lead glass in America. [50] The lead glass of this time period, commonly known as crystal because it was colorless and transparent, was typically used for fine tableware. [51] According to the American Philosophical Society, Stiegel's lead glass was "equal in beauty and quality to the generality of Flint ...
Yet another method is oxidative annealing of white lead: 3 Pb 2 CO 3 (OH) 2 + O 2 → 2 Pb 3 O 4 + 3 CO 2 + 3 H 2 O. In solution, lead(II,IV) oxide can be prepared by reaction of potassium plumbate with lead(II) acetate, yielding yellow insoluble lead(II,IV) oxide monohydrate Pb 3 O 4 ·H 2 O, which can be turned into the anhydrous form by ...