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One part per trillion (ppt) denotes one part per 1,000,000,000,000 (10 12) parts, and a value of 10 −12. This is equivalent to about thirty seconds out of every million years. This is equivalent to about thirty seconds out of every million years.
In October 2017, scientists working on the BASE experiment at CERN reported a measurement of the antiproton magnetic moment to a precision of 1.5 parts per billion. [ 11 ] [ 12 ] It is consistent with the most precise measurement of the proton magnetic moment (also made by BASE in 2014), which supports the hypothesis of CPT symmetry.
Technetium occurs naturally in the Earth's crust in minute concentrations of about 0.003 parts per trillion. ... (10 −9 g), equivalent to ten trillion atoms, of ...
In one case, leaking water contained 7.5 microcuries (280 kBq) of tritium per liter, which is 375 times the current EPA limit for drinking water, and 28 times the World Health Organization's recommended limit. [47] This is equivalent to 0.777 nanograms per litre (5.45 × 10 −8 gr/imp gal) or roughly 0.8 parts per trillion.
Ra, this limit is equivalent to 0.01 milligrams (0.00015 gr) of radium per metric ton or a concentration of 10 parts per trillion. (See § Gyp stacks below.) EPA approved the use of phosphogypsum for road construction during the Trump Administration in 2020, saying that the approval came at the request of The Fertilizer Institute, which ...
where F = solubility expressed in either mol l −1 or mol kg −1 atm −1, T = absolute temperature, S = salinity in parts per thousand (ppt), a 1, a 2, a 3, b 1, b 2, and b 3 are constants to be determined from the least squares fit to the solubility measurements. [74]
It is expressed in terms of nano-grams (ng), pico-grams (pg) or femto-grams (fg) with fg being better than pg better than ng. It can also be expressed in terms of parts per billion (ppb), parts per trillion (ppt) or parts per quadrillion (ppq). Sensitivity is important because most explosives have a low vapor pressure .
1 volume percent = 10,000 ppmv (i.e., parts per million by volume) with a million being defined as 10 6. Care must be taken with the concentrations expressed as ppbv to differentiate between the British billion which is 10 12 and the USA billion which is 10 9 (also referred to as the long scale and short scale billion, respectively).