A ser is an obsolete unit of dry volume[1] in India. In 1871 it was defined as being exactly 1 litre. After metrication in the mid-20th century, the unit became obsolete. It was the unit in pre-modern India which was so close to the metric values of volume approx equal to a litre.
Web site: Ser . 2007-02-19 . Sizes . dead . https://web.archive.org/web/20061020190240/http://www.sizes.com/units/ser.htm . 2006-10-20 .