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Akasa dhatu means space. Rupa (matter) cannot exist in single units. They generally exist as aggregate of eight or nine units. Such as aggregate is called a kalapa. Two adjacent fingers can be kept together; yet there is a space dividing them. Our bodies are filled with tiny kalapas, but still there is space in between them. This space is known as akasa dhatu. It is not discernible matter. It is a pannati (conventional), which becomes prominent only when two units of rupa are conduction.