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Full Idea
We consider heat not as a substance but as a state of vibration.
Gist of Idea
Heat is a state of vibration, not a substance
Source
James Joule (works [1870]), quoted by Peter Watson - Convergence 01 'Nature's'
Book Ref
Watson,Peter: 'Convergence' [Simon and Schuster 2016], p.24
A Reaction
The puzzle is that giving accurate accounts of vibrations, heat and movement require a quantitative substance, energy. But all we have here is movement, and the denial of a substance. Energy is 'nature's currency system'.