Abstract
EVERY one knows of the three states in which matter can exist—solid, fluid, and gas or vapour. Thin films of matter, familiar to all in the form of soap bubbles or lubricating films of oil, are no less than a fourth state, because, choose what physical constant we may, it will have a different value for any particular kind of matter in this state from what it has in any of those other states which are more easily apprehended by the senses.
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HARDY, W. Properties of Thin Films1. Nature 118, 700–701 (1926). https://doi.org/10.1038/118700a0
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DOI: https://doi.org/10.1038/118700a0
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