Differing types of desiccant dehumidifiers get the job done in different ways, but the principle system they use to extract moisture in the air is both absorption or adsorption. Absorption happens once the desiccant substance dissolves as it requires moisture in the air, as is the situation with humidity absorbers. https://dstdehumidifiers.co.uk/case-studies/desiccant-dehumidifiers-in-cold-stores/