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40W-80W LED street lamp head

  • 40W-80W LED street lamp head
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Product Reviews:

     TWeBLyKJSLn, November 18, 2012
    Helium==edit==And I found the answer using Yahoo:==edit2== Helium sofidilies only under great pressure. The resulting colorless, almost invisible solid is highly compressible; applying pressure in the laboratory can decrease its volume by more than 30%. With a bulk modulus on the order of 5d7107 Pa it is 50 times more compressible than water. Unlike any other element, Helium will fail to solidify and remain a liquid down to absolute zero at normal pressures. This is a direct effect of quantum mechanics: specifically, the zero point energy of the system is too high to allow freezing. Solid Helium requires a temperature of 1–1.5b0K (about -272b0C or -457b0F) and about 26 standard atmospheres (2.6 MPa) of pressure. It is often hard to distinguish solid from liquid helium since the refractive index of the two phases are nearly the same. The solid has a sharp melting point and has a crystalline structure .
     APuYwgaJtnEslMPrD, November 18, 2012
    The best would be calcium crdihole, if it is cheap in your area. This is because calcium crdihole contributes 3 ions to lowering the freezing point of water, compared to 2 of sodium crdihole. But sodium crdihole, salt, may be cheap for you. In Michigan, I am told that the state uses lactose sugar from cheese making to put on the roads, because they have that cheapest of all. Lactose contributes only one molecule toward lowering the freezing point.

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