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==Key Stage 5==
===Meaning===
'''Rest energy''' is the [[energy]] associated with the [[mass]] of a [[Subatomic Particle|particle]] , by the [[Mass-Energy Equivalence|mass-energy equivalence]], which is stationary relative to the observer.
===About Rest Energy===
: The '''rest energy''' of [[Subatomic Particle|subatomic particles]] is usually quoted in [[Electron-Volt|electron-volts (eV)]] or [[Megaelectron-Volt|megaelectron-volts (MeV)]].
: '''Rest energy''' is a [[scalar]] quantity as it has [[magnitude]] but does not have a direction.
: The '''rest energy''' of a [[Subatomic Particle|subatomic particle]] is released in an [[annihilation]] with its [[antiparticle]].
: The total '''rest energy''' is the product of the [[Rest Mass|rest mass]] and the [[Speed of Light|speed of light]] squared.
===Equation===
The '''rest energy''' is given by the equation
<math>c =</math> The speed of [[light]] (<math>3.00\times10^{8}ms^{-1}</math> in a [[vacuum]]).
===Examples===
{| border="1" style="border-collapse:collapse"
| style="height:20px; width:150px; text-align:center;"|[[Subatomic Particle|Particle]]
| style="height:20px; width:150px; text-align:center;"|[[Rest Mass]] / kg
| style="height:20px; width:150px; text-align:center;"|[[Unified Atomic Mass Units]]
| style="height:20px; width:150px; text-align:center;"|'''Rest Energy / MeV'''
|-
| style="height:20px; width:150px; text-align:center;"|[[Proton]] (<math>p</math>)
| style="height:20px; width:150px; text-align:center;"|<math>1.67\times10^{-27}</math>
| style="height:20px; width:150px; text-align:center;"|<math>1.007</math>
| style="height:20px; width:150px; text-align:center;"|<math>938</math>
|-
| style="height:20px; width:150px; text-align:center;"|[[Neutron]] (<math>n</math>)
| style="height:20px; width:150px; text-align:center;"|<math>1.67\times10^{-27}</math>
| style="height:20px; width:150px; text-align:center;"|<math>1.009</math>
| style="height:20px; width:150px; text-align:center;"|<math>939</math>
|-
| style="height:20px; width:150px; text-align:center;"|[[Electron]] (<math>e</math>)
| style="height:20px; width:150px; text-align:center;"|<math>9.11\times10^{-31}</math>
| style="height:20px; width:150px; text-align:center;"|<math>0.05486</math>
| style="height:20px; width:150px; text-align:center;"|<math>5.11</math>
|-
| style="height:20px; width:150px; text-align:center;"|[[Muon]] (<math>\mu</math>)
| style="height:20px; width:150px; text-align:center;"|<math>1.88\times10^{-28}</math>
| style="height:20px; width:150px; text-align:center;"|<math>0.1134</math>
| style="height:20px; width:150px; text-align:center;"|<math>106</math>
|-
| style="height:20px; width:150px; text-align:center;"|[[π-meson]] (<math>\pi^±</math>)
| style="height:20px; width:150px; text-align:center;"|<math>2.49\times10^{-28}</math>
| style="height:20px; width:150px; text-align:center;"|<math>0.1500</math>
| style="height:20px; width:150px; text-align:center;"|<math>140</math>
|-
| style="height:20px; width:150px; text-align:center;"|[[π-meson]] (<math>\pi^0</math>)
| style="height:20px; width:150px; text-align:center;"|<math>2.41\times10^{-28}</math>
| style="height:20px; width:150px; text-align:center;"|<math>0.1449</math>
| style="height:20px; width:150px; text-align:center;"|<math>135</math>
|-
| style="height:20px; width:150px; text-align:center;"|[[K-meson]] (<math>K^±</math>)
| style="height:20px; width:150px; text-align:center;"|<math>8.80\times10^{-28}</math>
| style="height:20px; width:150px; text-align:center;"|<math>0.5300</math>
| style="height:20px; width:150px; text-align:center;"|<math>494</math>
|-
| style="height:20px; width:150px; text-align:center;"|[[K-meson]] (<math>K^0</math>)
| style="height:20px; width:150px; text-align:center;"|<math>8.87\times10^{-28}</math>
| style="height:20px; width:150px; text-align:center;"|<math>0.5442</math>
| style="height:20px; width:150px; text-align:center;"|<math>498</math>
|-
| style="height:20px; width:150px; text-align:center;"|[[Photon]] (<math>\gamma</math>)
| style="height:20px; width:150px; text-align:center;"|<math>0</math>
| style="height:20px; width:150px; text-align:center;"|<math>0</math>
| style="height:20px; width:150px; text-align:center;"|<math>0</math>
|-
| style="height:20px; width:150px; text-align:center;"|[[Neutrino]] (<math>\nu</math>)
| style="height:20px; width:150px; text-align:center;"|<math>0</math>
| style="height:20px; width:150px; text-align:center;"|<math>0</math>
| style="height:20px; width:150px; text-align:center;"|<math>0</math>
|}