Deliquescent | Efflorescent |
These substances are solid and absorb moisture from the air. | These substances are also solid and release water spontaneously from hydrated salts. |
They dissolve in the absorbed moisture and form solutions. | They do not absorb moisture or water vapour. |
They are also called as dessicants. | They are also called as crystals. |
They show high water affinity. | They do not show water affinity. |