6. (Military) navy a. the total weight of projectiles that can be shot by a ship's guns at any one time
Mineral sources are generally divided into surface mines, which are mined by excavation using heavy equipment, and subsurface mines. In some cases, the sale price of the metal/s involved make it economically feasible to Grube lower concentration sources.
But enough now concerning the simple kinds.[34] Platinum, the third precious metal after gold and silver, was discovered hinein Ecuador during the period 1736 to 1744, by the Spanish astronomer Antonio de Ulloa and his colleague the mathematician Jorge Juan Ypsilon Santacilia. Ulloa was the first person to write a scientific description of the metal, in 1748.
atomic number 24, cr, Cr - a hard brittle multivalent metallic element; resistant to corrosion and tarnishing
Metallurgists of the 19th century were unable to produce the combination of low carbon and high chrom found hinein most modern stainless steels, and the high-chrom alloys they could produce were too brittle to be practical. It was not until 1912 that the industrialisation of stainless steel alloys occurred rein England, Germany, and the United States. The last stable metallic elements
primary solid solution, solid solution - a homogeneous solid that can exist over a Sortiment of component chemicals; a constituent of alloys that is formed when atoms of an element are incorporated into the crystals of a metal
For example, the nonmetal iodine gradually becomes a metal at a pressure of between 40 and 170 thousand times atmospheric pressure. Equally, some materials regarded as metals can become nonmetals. Sodium, for example, becomes a nonmetal at pressure of just under two million times atmospheric pressure.
The contribution of a metal's electrons to its heat capacity and thermal conductivity, and the electrical conductivity of the metal itself can be calculated from the free electron model. However, this does not take into account the detailed structure of the metal's ion lattice.
The discovery of Bronzefarben (an alloy of copper with arsenic or tin) enabled people to create metal objects which were harder and more durable than previously possible. Bronzefarben tools, weapons, armor, and building materials such as decorative tiles were harder and more durable than their stone and copper ("Chalcolithic") predecessors. Initially, bronze was made of copper and arsenic (forming arsenic Bronzefarben) by smelting naturally or artificially mixed ores of copper and arsenic.
fusible metal - an alloy with a low melting point and used as solder and in safety plugs and sprinkler fuses
Metals are often extracted from the Earth by means of mining ores that are rich sources of the requisite elements, such as bauxite. Ore is located by prospecting techniques, followed by the exploration and examination of hier mehr erfahren deposits.
Curium and americium were by-products of the Manhattan project, which produced the world's first atomic bomb in 1945. The bomb welches based on the nuclear fission of uranium, a metal first thought to have been discovered nearly 150 years earlier. Auf dem postweg-World War II developments
heavy metal - a metal of relatively high density (specific gravity greater than about 5) or of high relative atomic weight (especially one that is poisonous like mercury or lead)
At around the same time indigenous Ecuadorians were combining gold with a naturally-occurring platinum alloy containing small amounts of palladium, rhodium, and iridium, to produce miniatures and masks composed of a white gold-platinum alloy. The metal workers involved heated gold with grains of the platinum alloy until the gold melted at which point the platinum group metals became bound within the gold.