if something is soluble in something , then that something can be dissolved in something forming a solution
sugar is not water_soluble_substance. sugar is water_soluble_substance. water_soluble_vitamin is not vitamin. fabric_softener is not water_soluble_substance. water_soluble_substance is tangible_thing. detergent is water_soluble_substance. water_soluble_substance is not tangible_thing. mixture is substance. detergent is not water_soluble_substance. water_soluble_vitamin is vitamin.