SINCE 1828
ortho-hydrogen
noun
\ ¦ȯ(r)thə+\
Definition of ortho-hydrogen
: molecular hydrogen in which the two hydrogen nuclei are spinning in the same direction
ordinary hydrogen gas comprises an equilibrium mixture of three parts of ortho-hydrogen (with parallel nuclear spin) to one part of para-hydrogen (with antiparallel nuclear spin)— Otto Reinmuth
— compare para-hydrogen
Comments on ortho-hydrogen
What made you want to look up ortho-hydrogen? Please tell us where you read or heard it (including the quote, if possible).
Test Your Vocabulary
Time Traveler Quiz: Which Word Came First?
-
- Which came first?
Test your vocabulary with our 10-question quiz!
TAKE THE QUIZ
Test Your Knowledge - and learn some interesting things along the way.
TAKE THE QUIZLove words? Need even more definitions?
Merriam-Webster unabridged
Words at Play
Ask the Editors
Word Games
-
Time Traveler Quiz: Which Word Came First?
Which word entered the English language first?
Take the quiz -
Slippery Words Quiz—Changing with the Times
Do you know these earlier meanings of words?
Take the quiz -
How Strong Is Your Vocabulary?
Test your vocabulary with our 10-question quiz!
Take the quiz -
Word Winder's CrossWinder
Play the game
Share ortho-hydrogen
Resources for ortho-hydrogen