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| hydrogen ion: 62 phrases in 32 subjects |
| Agriculture | 1 |
| Analytical chemistry | 2 |
| Astronomy | 1 |
| Chemistry | 2 |
| Chromatography | 1 |
| Construction | 3 |
| Ecology | 2 |
| Electrochemistry | 1 |
| Electronics | 2 |
| Energy industry | 2 |
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| Genetics | 1 |
| Geophysics | 1 |
| Makarov | 4 |
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| Medical appliances | 3 |
| Metallurgy | 1 |
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| Military | 2 |
| Nanotechnology | 8 |
| Nautical | 1 |
| Navigation | 2 |
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| Oil / petroleum | 2 |
| Oil and gas | 1 |
| Packaging | 2 |
| Physics | 2 |
| Polymers | 1 |
| Silicate industry | 1 |
| Technology | 6 |
| Water supply | 1 |
| Weapons of mass destruction | 1 |