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The IDLH (immediately dangerous to life and health) value is 100 mg/m 3. [223] Copper is a constituent of tobacco smoke. [224] [225] The tobacco plant readily absorbs and accumulates heavy metals, such as copper from the surrounding soil into its leaves. These are readily absorbed into the user's body following smoke inhalation. [226]
This hearsay value is posted in the 48th Edition of the Handbook of Chemistry and Physics on page E-4. [27] Pyroxenite: 4.3 ± 0.1 List: Birch and Clark in Robertson, page 31. [31] 300 This summary came from 2 samples in 1940. Quartz, single crystal: 12 [64] to c axis, 06.8 [64] to c axis Rutgers University
The International Annealed Copper Standard (IACS) is a standard established in 1914 by the United States Department of Commerce. [1] It is an empirically derived standard value for the electrical conductivity of commercially available copper.
Copper mining activity increased in the early 2000s because of increased price: the price increased from an average of $0.76 per pound for the year 2002, to $3.02 per pound for 2007. [2] A number of byproducts are recovered from American copper mining.
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The effective temperature coefficient varies with temperature and purity level of the material. The 20 °C value is only an approximation when used at other temperatures. For example, the coefficient becomes lower at higher temperatures for copper, and the value 0.00427 is commonly specified at 0 °C. [53]
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