Are charge measurements normalised to area, mass or some other quantity?
Last reviewed: .
Are charge measurements normalised to area, mass or some other quantity?
The polarity is a positive electric charge at rest, and it is measured as surface charge density, in nanocoulombs per square centimetre.
The coulomb is the unit of electric charge, and the National Institute of Standards and Technology gives the quantity the coulomb measures as “electric charge, amount of electricity.” Surface charge density is charge per unit area, and nanocoulombs per square centimetre is the unit in which the company states it. The company publishes no measurement procedure, no instrument record and no uncertainty budget. The company states no value and publishes no data set. The charge is measured on every production run, and the measurement can be repeated on any filter, upon request.
Source: Statement of Classification for the NanoFlashing™ Air Filter, sections 2.2 and 2.3, issued by NF Technical Products Inc.; National Institute of Standards and Technology, Guide for the Use of the International System of Units (SI), NIST Special Publication 811 (2008 ed.), § 4.2.1, Table 3, https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication811e2008.pdf.
Reviewed on .
Sources
- Statement of Classification for the NanoFlashing™ Air Filter, sections 2.2 and 2.3, issued by NF Technical Products Inc.
- National Institute of Standards and Technology, NIST Special Publication 811 (2008 ed.), § 4.2.1, Table 3