What substance is table salt when it becomes damp from water in the air?

When table salt (sodium chloride) becomes damp from water in the air, it absorbs moisture and can dissolve slightly, forming a saturated solution around the salt crystals. This process is known as deliquescence. The dampness can cause the salt to clump together and lose its free-flowing texture. Ultimately, it still remains sodium chloride, but in a more hydrated state.