The ash that remains after a substance has been exposed to water and is insoluble within it.

जल अघुलनशील राख

English Usage: The laboratory test measured the water insoluble ash content in the soil sample.

Hindi Usage: प्रयोगशाला परीक्षण में मिट्टी के नमूने में जल अघुलनशील राख की मात्रा मापी गई।