external field

https://doi.org/10.1351/goldbook.13817
Field surrounding a molecular or ionic species emanating from a source external to that species.
Note: Fields include electromagnetic, hydrodynamic, mechanical, etc.
Source:
PAC, 2012, 85, 463. (Terminology for aggregation and self-assembly in polymer science (IUPAC Recommendations 2013)) on page 470 [Terms] [Paper]