Terme de Glossaire
Parts-per notation
In science and engineering, the parts-per notation is a set of pseudo units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Commonly used are ppm (parts-per-million, 10–6), ppb (parts-per-billion, 10–9), ppt (parts-per-trillion, 10–12) and ppq (parts-per-quadrillion, 10-15).
eNq1mN1y2jAQhe95Co/vsSEhEDqGTEtDy0wyoSRMO73JCHsBUSE5K4mfPn1lTFvSsZtEoEss++xae/Tt4uhqs2TeClBSwTt+Paj5HvBYJJTPOv74oV+99K+6lWhBVuTgtlZQC+oN34sZkbLjZ6vBBAiXwbfbm49gngf0uxUvEpMFxOrZfVpRFnwmcn5L0uweL1oJmnhLUHORdPxUq91VL5IKTRbdtcAfMiUxROH+yuHq4rFxeD0KM7FXqGoJeEP4rFAUuJVmrBGBqx5RMBO4LZSOH8+b9faZXdJUjkAKjTEMiZoPUaxoAklhnClhEqyCTNfJPeCKgcqCFIqH8VJaaZMF2YzgaVCc83uz2lMbVa1V661Gs37ROG+eXV62rELhwU4VV2IpQ1ONdvvsIgQepgSVrKaAVS4UUcbnliUaClSEOSoOlb3nJnMUB+HpRRMkVKaMbIOFTG23iiAxy4AGBe5eJHuDBzRwYmbP/tHnmrHwjVmP9+hwlHFGpp7QXJUQpD+y3Yie4Ao25RW1g57a7L1IQZ5O9qfgxcAf6gmjsS3ZDHw0SDUeDUrB5gQKH4iEMbqjwlfKE7GWp6fNYXUdZZ/ugPmfbnnRtj5I342NSrrNtUaRQmgYROUxaBnwqTgWKsaZxVJ/fHlyT+4GIBETBiUjUNUSNMaMvyc2Z3Z3d5TyhULRT9cPtj75ogG397ufhdI06ewrbMdgF2A3nixN++0Ozw/5a0bjczs7YzFB5kql8l0YrtfrAGHKYGMOjAw0ozAD85/FGfEPmq27Qd1JR88nnJycjlKf5O3QrmK2h/Cl3n/sPLt/fj83F8ZQqOGImuS8dkbVwfXpQf13mHWW9vAZWtyF2Q2eOyS4GoT0pAyM1q3BVJX30WDibjqlJd9QSl0Zhfn3m24lCrNvN93KL/mn+U4=
Zu8zz2CbmURVq67G