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The tonne (t) is an SI-compatible unit of mass equal to a megagram (Mg), or 10 3 kg. The unit is in common use for masses above about 10 3 kg and is often used with SI prefixes. For example, a gigagram ( Gg ) or 10 9 g is 10 3 tonnes, commonly called a kilotonne .
The kilogram, symbol kg, is the SI unit of mass. It is defined by taking the fixed numerical value of the Planck constant h to be 6.626 070 15 × 10 −34 when expressed in the unit J⋅s, which is equal to kg⋅m 2 ⋅s −1, where the metre and the second are defined in terms of c and Δν Cs. —
Micrograms per cigarette Effect on DNA Ref. Acrolein: 122.4 Reacts with deoxyguanine and forms DNA crosslinks, DNA-protein crosslinks and DNA adducts [107] Formaldehyde: 60.5 DNA-protein crosslinks causing chromosome deletions and re-arrangements [108] Acrylonitrile: 29.3 Oxidative stress causing increased 8-oxo-2'-deoxyguanosine [109] 1,3 ...
The Earth's crust from the surface to 25 km (15 mi) down is calculated to contain 10 17 kg (2 × 10 17 lb) of uranium while the oceans may contain 10 13 kg (2 × 10 13 lb). [11] The concentration of uranium in soil ranges from 0.7 to 11 parts per million (up to 15 parts per million in farmland soil due to use of phosphate fertilizers ), [ 63 ...