dark hydrogen en · NOUN
Etymology
From being a state of matter which neither transmits nor reflects visible light, but can transmit infrared.
Meanings
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(uncountable) A state of hydrogen that is poorly electrically conductive (much less conductive than metallic hydrogen).
However, the rates of dark hydrogen production were relatively low.
2013, Tokio Ohta, Solar-Hydrogen Energy Systems, →ISBN:The over-unity energy production could be due to a gradual transformation of hydrogen to dark hydrogen in the same state as in water.
2007, Florentin Smarandache, V. Christianto, Hadron models and related New Energy issues, →ISBN, page 96:One particular species of these candidates seems to be not dark at all: so-called dark hydrogen masses located in the optical Galactic disk.
2000, F. Combes, G. Pineau des Forets, Molecular Hydrogen in Space, →ISBN, page 48: