The third (solar) center is located on the spine at the level of the solar plexus. At this level we experience the quality of expansiveness, warmth, and joviality in ourselves. This chakra therefore is the seat of the element of fire in our nature.
Fire and water seem to have in a sense opposing qualities. The smooth flow of the watery quality is downward in its direction and is therefore contractive in relation to the essentially upward expansiveness of the fiery quality.
The assimilation of food through combustion is governed by the activity of this chakra. The person who has strong vibrations at the level of the solar chakra will absorb great benefit from food he eats. The kind of person who never seems to absorb enough energy from food however much he may eat is deficient in the fire element in his system.