efflorescence

https://doi.org/10.1351/goldbook.E01909
The reverse of @D01582@: the drying of a @S05447@ solution when the vapour pressure of water in the @S05471@ of a substance is greater than the @P04420@ of water in the ambient air. Also refers to the loss of water of @C01434@ from a solid @S05447@ such as Na2CO3·10H2O.
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2186 [Terms] [Paper]