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==Key Stage 5==
===Meaning===
The law of '''conservation of Lepton Number''' is the observation that in all [[Fundamental Interactions|fundamental interactions]] the sum of [[Lepton]]s and [[Lepton|Anti-lepton]]s is the same before and after the [[Fundamental Interaction|interaction]].
===About Conservation of Lepton Number===
: [[Lepton]]s have a '''Lepton number''' of 1.
: [[Lepton|Anti-lepton]]s have a '''lepton number''' of -1.
: If a [[Lepton]] comes into existence an [[Lepton|Anti-lepton]] must also come into existence.
: '''Conservation of Lepton Number''' can be applied to all [[Fundamental Interactions|fundamental interactions]] to balance the [[Nuclear Equation|equations]] and to ascertain the types of [[Subatomic Particle|particles]] produced.
===Examples===
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