A ser is an obsolete unit of dry volume 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.
"Ser". Sizes. Archived from the original on 2006-10-20. Retrieved 2007-02-19.