You are looking for a liquid definition of fire, so to speak.QUESTION:
What exactly, in terms of its material and force composition, is meant by the word "spirit"?
According to the school of thought of Jesu(s) spirit is more of a mental quality than a materail one.
He said: "The words that I speak unto you are spirit and they are life" or in a different manner "My mental conceptions are spiritual and energy/energetic".
That which is spiritual has no materialistic part. But the spiritual can INDUCE forces in the material world through the conscious effort.