Next to agni is Aapa (jala) Mahabhoota. Its main sense attribute is the sense of sense of taste (rasa). and liquidity (Dravatwa) is the basic property. Biological humors main constituent is aapa and bringing and keeping two or more things together is possible because of this Mahabhoota. Theoretically The cells of organs, particles of herbs and minerals are kept together by this Mahabhoota as all the biological, chemical and bio-chemical bonds are possible because of this Mahabhoota.