Convert Nanogram (ng) to Quarter (US) (qr (US)) instantly.
About these units
Nanogram (ng)
A nanogram equals 10⁻⁹ grams and is widely used across chemistry, toxicology, pharmaceuticals, and material science. Quantities such as trace contaminants, allergens, pesticides, or drug residues often fall in the nanogram range. In medicine, nanogram-per-liter concentrations are standard in blood tests, especially for cardiac markers like troponin, where even tiny amounts can indicate severe physiological conditions. Nanogram quantities are also important in environmental regulation and forensic science. The nanogram unit illustrates the power of modern analytical tools that can detect vanishingly small quantities with profound real-world implications.
Quarter (US) (qr (US))
The US quarter equals 25 pounds, serving as a smaller commercial subdivision of the hundredweight. It was used for pricing agricultural goods, livestock feed, and some industrial materials. Its convenience arises from the fact that four quarters make a hundredweight, simplifying scaling between small and medium quantities. Today it is mostly of historical interest, but agricultural economists still encounter it when analyzing archival data.