- 行业: Mining
- Number of terms: 33118
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The U.S. Bureau of Mines (USBM) was the primary United States Government agency conducting scientific research and disseminating information on the extraction, processing, use, and conservation of mineral resources.
Founded on May 16, 1910, through the Organic Act (Public Law 179), USBM's missions ...
That temperature at which a single, pure solid changes phase to a liquid or to a liquid plus another solid phase, upon the addition of heat at a specific pressure. Unless otherwise specified, melting points are usually stated in terms of 1 kPa. The term can also be used for the isothermal melting of certain mixtures, such as eutectic mixtures. Erroneously used also to refer to the temperature at which some appreciable but unspecified amount of liquid develops in a complex solid mixture that possesses a melting range; e.g., the melting point of granite. Abbrev.: mp or MP.
Industry:Mining
That theory of the origin of coal that holds that the plant matter constituting coal was washed from its original place of growth and deposited in another locality where coalification then came about.
Industry:Mining
That velocity below which, in a particular conduit, laminar flow will always exist, and above which the flow may be either laminar or turbulent, depending on circumstances. Also known as lower critical velocity.
Industry:Mining
That which is produced or made; any tangible result of industrial or other labor. The yield or output of a mine, metallurgical plant, or quarry.
Industry:Mining
That which tends to put a stationary body in motion or to change the direction or speed of a moving body.
Industry:Mining
The 17 possible combinations of symmetry elements which may coexist in 2 dimensions. Compare: space group
Industry:Mining
The ability of a coal to fire spontaneously. This phenomenon can occur whenever the heat generated from oxidation reactions in a coal exceeds the heat dissipated. This characteristic varies for different types of coals and even for coals of the same classification but of different origin.
Industry:Mining
The ability of a current of water or wind to transport detritus, in terms of particle size rather than amount, measured as the diameter of the largest particle transported. It depends on velocity: a small, but swift stream, e.g., may have greater competence than a larger but slower-moving stream. Adj: competent.
Industry:Mining
