Also known as: ld.
LD has various meanings in the Science category. Discover the full forms, definitions, and usage contexts of LD in Science.
Chemical symbol Pb. Very soft, bluish-white metal; highly malleable and ductile; poor conductor of electricity, but good noise-dampening material; resistant to corrosion and radiation. Obtained from galena ore. Major end-use is storage batteries, which accounts for 60% of world lead consumption. Also used in ammunition, but has declining use in paints, plumbing equipment and cable coverings because of its toxicity.
ScienceThe smooth, open area of a grooved surface, such as the bands of metal between the grooves in a piston which carry the piston rings. The metal separating a series of Grooves. For profile-sharpened milling cutters, the relieved portion immediately behind the cutting edge. On punches, the portion adjacent to the nose that is parallel to the axis and of maximum diameter.
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