Conceptual Physics (12th Edition)

Published by Addison-Wesley
ISBN 10: 0321909100
ISBN 13: 978-0-32190-910-7

Chapter 34 - Think and Explain - Page 654-655: 59


There is no critical mass for fusion.

Work Step by Step

Too much fissionable material in one place (above a "critical mass") can undergo a spontaneous chain reaction starting from just one ejected neutron. On the other hand, fusion fuel, much like chemical combustion, requires a high temperature to start the reaction. It is like combustible fuel, e.g., gasoline. It has no “critical mass,” and won't spontaneously ignite.
Update this answer!

You can help us out by revising, improving and updating this answer.

Update this answer

After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.