What is Qi (Chi / Ki)?

Qi (chi): is a physical force like electricity, magnetism or gravity. You cannot see electricity running through the wires, only that the light bulb is shining. You cannot see qi flowing through the meridians of your lovers body, but you'll notice the spark of life in her eyes. You have no experience of loss of gravity until you go into outer orbit. You may have no experience of qi until you are dead. Once you have learned that qi exists, you may start seeing/feeling qi. Then qi may appear a bit like electricity, magnetism or gravity, but is neither of those. In scientific terms, Chi is the Unifying Force, the holy grail that has yet evaded modern Physics.