THAT LEAD is poisonous is not a new discovery.
(For commercial production, see lead processing.)
When they do, they form lead sulphate right where the lead atoms are.
Lead can be found in lead-based paint, contaminated soil, dust, and drinking water.
These, like atmospheric lead, can increase blood lead levels.
The symbol Pb for lead is an abbreviation of the Latin word for lead, plumbum.
Low-level lead poisoning generally results from unavoidable exposure to atmospheric lead pollutants.
The positive plate is a lead frame with small squares which are filled with lead peroxide, as it is called.
The Earth can be assumed to be a very large sample containing lead evolving from primordial lead by radiogenic increments.
The shortage could continue; most lead comes from mines whose main product is zinc, and many new zinc mines are low in lead.
The new proposal would instead require water systems with those lead levels to replace 3 percent of lead service lines each year.
…material of the positive electrode, lead dioxide, combines with the electrolyte, sulfuric acid, to produce lead sulfate and water during discharge.
Together with the compound lead oxide (PbO2) and with lead-antimony or lead-calcium alloys, it is employed in common storage batteries.
Waterfowl, such as geese and loons, sometimes ingest lead-based fishing sinkers and lead shot, and raptors may prey on lead-contaminated rodents.
Rarely found free in nature, lead is present in several minerals, but all are of minor significance except the sulfide, PbS (galena, or lead glance), which is the major source of lead production throughout the world.
But both xenon and lead nuclei are packed with protons and neutrons, and though lead has more of them, by eye I don’t think anyone could tell the difference between a xenon-xenon collision and a lead-lead one.
And a report by IPEN published in 2014 notes that in many countries where lead paint is bought, comparable lead-free brands are often sold at a similar price, meaning switching to lead-free production should have little impact on costs.
When freshly cut, lead oxidizes quickly, forming a dull gray coating, formerly thought to be lead suboxide, Pb2O, but now recognized as a mixture of lead and lead monoxide, PbO, which protects the metal from further corrosion.
Although the new proposal would extend the timetable for replacing lead pipes, it would include new requirements that schools and day care centers be tested for lead, and, if elevated lead levels are found, customers would have to be told within 24 hours, not the current standard of 30 days.
Uranium-thorium-lead dating, also called Common-lead Dating, method of establishing the time of origin of a rock by means of the amount of common lead it contains; common lead is any lead from a rock or mineral that contains a large amount of lead and a small amount of the radioactive progenitors of lead—i.e., the uranium isotopes uranium-235 and uranium-238 and the thorium isotope thorium-232.
- a soft heavy toxic malleable metallic element; bluish white when freshly cut but tarnishes readily to dull grey
Example: the children were playing with lead soldiers
- an advantage held by a competitor in a race
Example: he took the lead at the last turn
- take somebody somewhere
- produce as a result or residue
- mixture of graphite with clay in different degrees of hardness; the marking substance in a pencil
- evidence pointing to a possible solution
Example: the police are following a promising lead
- a position of being the initiator of something and an example that others will follow (especially in the phrase `take the lead')
Example: he takes the lead in any group
- tend to or result in
- travel in front of; go in advance of others
- the angle between the direction a gun is aimed and the position of a moving target (correcting for the flight time of the missile)
- cause to undertake a certain action
- the introductory section of a story
Example: it was an amusing lead-in to a very serious matter
- stretch out over a distance, space, time, or scope; run or extend between two points or beyond a certain point
- (sports) the score by which a team or individual is winning
- an actor who plays a principal role
- be in charge of
- (baseball) the position taken by a base runner preparing to advance to the next base
Example: he took a long lead off first
- be ahead of others; be the first
- be conducive to
- an indication of potential opportunity
- a news story of major importance
- lead, as in the performance of a composition
- the timing of ignition relative to the position of the piston in an internal-combustion engine
- lead, extend, or afford access
- move ahead (of others) in time or space
- restraint consisting of a rope (or light chain) used to restrain an animal
- cause something to pass or lead somewhere
- thin strip of metal used to separate lines of type in printing
- preside over
- a jumper that consists of a short piece of wire
Example: it was a tangle of jumper cables and clip leads
- the playing of a card to start a trick in bridge
Example: the lead was in the dummy
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Uranium-thorium-lead dating also called Common-lead Dating method of establishing the time of origin of a rock by means of the amount of common lead it contains common lead is any lead from a rock or mineral that contains a large amount of lead and a small amount of the radioactive progenitors of lead—ie the uranium isotopes uranium-235 and uranium-238 and the thorium isotope thorium-232