Skip to main content

Reset your password

Please enter the e-mail address you used to register to reset your password

Note: The verification e-mail to change your password should arrive immediately. However, in some cases it takes longer. Don't forget to check your spam folder.

If you haven't received the e-mail in 24 hours, please contact customerservices@ioppublishing.org

Registration complete

Thank you for registering with Physics World
If you'd like to change your details at any time, please visit My account

Close
Particles and interactions

Particles and interactions

Home » Particle and nuclear » Particles and interactions » What is antimatter?

What is antimatter?

15 Aug 2012
In less than 100 seconds, Helen Heath explains why some particles have equal but opposite partners.

You’ve reached the limit of what you can view on Physics World without registering

If you already have an account on Physics World, then please sign in to continue reading

If you do not yet have an account, please register so you can

  • Access more than 20 years of online content
  • Choose which e-mail newsletters you would like to receive
Back to Particles and interactions Particles and interactions
Read previous

How do you recognize a penguin in a crowd?
Read next

What is a black hole?

Discover more from Physics World

Related jobs

Related events

Copyright © 2025 by IOP Publishing Ltd and individual contributors