Changes

'''Antimatter''' is a [[material]] made from [[antiparticle]]s, which when in contact with [[matter]] will [[Annihilation|annihilate]] one another to produce a pair of [[Gamma-ray|gamma ray]] [[photon]]sor other high energy particles.

: *Many [[Subatomic Particle|particle]]s of [[matter]] have '''antimatter''' counterparts which have the same [[mass]] but opposite [[Electrical Charge|electrical charge]].: *During [[Pair-Production|pair-production]] a [[Subatomic Particle|particle]] and its '''antimatter''' counterpart appear.: *Most '''antiparticles''' are given the name of their counterpart [[Subatomic Particle|particle]] with the addition of the prefix '''anti'''. However, the '''antiparticle''' counterpart of the [[electron]] is known as the [[positron]].*[[Antimatter]] appears to be rare in the [[universe]] compared to [[matter]] which confuses scientists as the [[Big Bang Theory]] suggests there should have been equal quantities of [[matter]] and [[antimatter]] produced in the early [[universe]].*[[Antimatter]] is produced in high-energy processes such as cosmic ray interactions and particle collisions.*[[Antimatter]] has potential applications in [[Medical Imaging|medical imaging]] and cancer treatment.*[[Antimatter]] propulsion is a theoretical concept for future space travel.   {| border="1" style="border-collapse:collapse"| style="height:20px; width:100px; text-align:center;"|'''Antiparticle'''| style="height:20px; width:100px; text-align:center;"|'''Composition'''| style="height:20px; width:100px; text-align:center;"|[[Electrical Charge|'''Charge''']]/[[Elementary Charge|e]]| style="height:20px; width:100px; text-align:center;"|'''[[Strangeness]]'''| style="height:20px; width:100px; text-align:center;"|'''[[Conservation of Baryon Number|Baryon Number]]'''| style="height:20px; width:100px; text-align:center;"|'''[[Conservation of Lepton Number|Lepton Number]]'''|-| style="height:20px; width:100px; text-align:center;"|[[Antiproton]]| style="height:20px; width:100px; text-align:center;"|<math>\bar{u}\bar{u}\bar{d}</math>| style="height:20px; width:100px; text-align:center;"|<math>Q=-1</math>| style="height:20px; width:100px; text-align:center;"|<math>S=0</math>| style="height:20px; width:100px; text-align:center;"|<math>B=-1</math>| style="height:20px; width:100px; text-align:center;"|<math>L=0</math>|-| style="height:20px; width:100px; text-align:center;"|[[Antineutron]]| style="height:20px; width:100px; text-align:center;"|<math>\bar{u}\bar{d}\bar{d}</math>| style="height:20px; width:100px; text-align:center;"|<math>Q=0</math>| style="height:20px; width:100px; text-align:center;"|<math>S=0</math>| style="height:20px; width:100px; text-align:center;"|<math>B=-1</math>| style="height:20px; width:100px; text-align:center;"|<math>L=0</math>|-| style="height:20px; width:100px; text-align:center;"|[[Positron]]| style="height:20px; width:100px; text-align:center;"|[[Fundamental Particle|Fundamental]]| style="height:20px; width:100px; text-align:center;"|<math>Q=+1</math>| style="height:20px; width:100px; text-align:center;"|<math>S=0</math>| style="height:20px; width:100px; text-align:center;"|<math>B=0</math>| style="height:20px; width:100px; text-align:center;"|<math>L=-1</math>|-| style="height:20px; width:100px; text-align:center;"|[[Anti Electron-Neutrino]]| style="height:20px; width:100px; text-align:center;"|[[Fundamental Particle|Fundamental]]| style="height:20px; width:100px; text-align:center;"|<math>Q=0</math>| style="height:20px; width:100px; text-align:center;"|<math>S=0</math>| style="height:20px; width:100px; text-align:center;"|<math>B=0</math>| style="height:20px; width:100px; text-align:center;"|<math>L=-1</math>|}