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- Film speed (5065 bytes)
66: | Ilford Commercial Ortho - Hydrogen (20221 bytes)
169: known as ortho- and para-hydrogen (this is different from [[isot...
171: In ortho-hydrogen the nuclear spins are parallel (form a t...
174: ...osed of about 25% of the para form and 75% of the ortho form (the
177: the ortho form has higher energy (is an [[excited state]]),...
181: ...ng. Therefore, some [[catalyst|catalysts]] of the ortho-para conversion process are used during hydrogen ...
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