Because most of the salty qualities of salt refer to the dissolved form. Once solid salt enters our mouth, it gets dissolved by the liquid in our mouth and food/drink. That’s how we taste the salt. Inside the body, salt ions also maintain ionic concentrations when dissolved since our bodies are mostly water.
Salt as a solid has different properties than when it’s dissolved. For example, solid salt is an insulator while dissolved salt can conduct electricity. Solid salt is an abrasive and can cause wounds. Dissolved salt in saline wash can wash out wounds.
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