It's by a process known as 'osmosis' Basically, the outer covering of the bean is water permeable, and the 'seed' inside the bean is porous. Water is absorbed through the outer membrane, which swells the 'pulp' of the seed, causing it to swell.
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Dried beans can absorb approximately 2-3 times their volume in water when hydrated. This process helps them soften and expand, making them suitable for cooking.
It depends on the amount of time you are using, the amount of beans you are using, the size of the bean, the kind of the bean,etc.
You can add about 1/4 cup of soda per pound of dried beans when soaking them in water. The soda helps to soften the beans and reduce cooking time. Be sure to rinse the beans thoroughly after soaking to remove any residual soda before cooking.
Antidiuretic hormone ADH
A popsicle stick can absorb a small amount of water, usually no more than a few drops. The level of absorption depends on the type of wood and the conditions in which it is exposed to water.
Wool can absorb up to 30% of its weight in water without feeling damp. Wool fibers have a natural resistance to absorbing moisture, which allows for efficient moisture management properties.
Air plants (Tillandsia) are a type of plant that can survive without much water. They absorb moisture through their leaves from the air, making them a good option for low-water environments.