Rasa, the preliminary dhatu of Ayurveda, refers to the matter that is produced after the digestion of food in the human body. Rasa Dhatu provides nourishment to every single cell and tissue of human body.
Space in Ayurveda, which is also known as akash is defined as the most delicate of all the elements of the nature. Ayurveda states that akash or space is actually the first element to come into physical existence. Akash has the most expansive and least concrete value.