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Created page with "==Key Stage 5== ===Meaning=== A '''physical constant''' is a quantity which is believed to have the same value at all points in space and time. ===About Physical Constants===..."
==Key Stage 5==
===Meaning===
A '''physical constant''' is a quantity which is believed to have the same value at all points in space and time.
===About Physical Constants===
: '''Physical constants''' are found through [[measure]]ment and therefore carry a level of [[uncertainty]] in their values. As a result much time is spent by [[physicist]]s to reduce that [[uncertainty]] with more [[precise]] and [[accurate]] [[measure]]ments.
: The '''physical constants''' you should know of, but do not need to memorise are:
{| class="wikitable"
|-
| style="height:20px; width:300px; text-align:center;" |'''Physical Constant'''
| style="height:20px; width:50px; text-align:center;" |Symbol
| style="height:20px; width:100px; text-align:center;" |Value
| style="height:20px; width:100px; text-align:center;" |Units
|-
| style="height:20px; width:300px; text-align:center;" |Elementary Charge
| style="height:20px; width:50px; text-align:center;" |<math>e</math>
| style="height:20px; width:100px; text-align:center;" |<math>1.60\times10^{-19}</math>
| style="height:20px; width:100px; text-align:center;" |<math>C</math>
|-
| style="height:20px; width:300px; text-align:center;" |Rest Mass of a Proton
| style="height:20px; width:50px; text-align:center;" |<math>m_p</math>
| style="height:20px; width:100px; text-align:center;" |<math>1.67\times10^{-27}</math>
| style="height:20px; width:100px; text-align:center;" |<math>kg</math>
|-
| style="height:20px; width:300px; text-align:center;" |Rest Mass of a Neutron
| style="height:20px; width:50px; text-align:center;" |<math>m_n</math>
| style="height:20px; width:100px; text-align:center;" |<math>1.68\times10^{-27}</math>
| style="height:20px; width:100px; text-align:center;" |<math>kg</math>
|-
| style="height:20px; width:300px; text-align:center;" |Rest Mass of an Electron
| style="height:20px; width:50px; text-align:center;" |<math>m_e</math>
| style="height:20px; width:100px; text-align:center;" |<math>9.11\times10^{-31}</math>
| style="height:20px; width:100px; text-align:center;" |<math>kg</math>
|-
| style="height:20px; width:300px; text-align:center;" |Gravitational Constant
| style="height:20px; width:50px; text-align:center;" |<math>G</math>
| style="height:20px; width:100px; text-align:center;" |<math>6.67\times10^{-11}</math>
| style="height:20px; width:100px; text-align:center;" |<math>Nm^2kg^{-1}</math>
|-
| style="height:20px; width:300px; text-align:center;" |Permittivity of Free Space
| style="height:20px; width:50px; text-align:center;" |<math>\varepsilon_0</math>
| style="height:20px; width:100px; text-align:center;" |<math>8.85\times10^{-12}</math>
| style="height:20px; width:100px; text-align:center;" |<math>Fm^{-1}</math>
|-
| style="height:20px; width:300px; text-align:center;" |Permeability of Free Space
| style="height:20px; width:50px; text-align:center;" |<math>\mu_0</math>
| style="height:20px; width:100px; text-align:center;" |<math>4\pi\times10^{-7}</math>
| style="height:20px; width:100px; text-align:center;" |<math>Hm^{-1}</math>
|-
| style="height:20px; width:300px; text-align:center;" |Speed of Light in Free Space
| style="height:20px; width:50px; text-align:center;" |<math>c</math>
| style="height:20px; width:100px; text-align:center;" |<math>3.00\times10^{8}</math>
| style="height:20px; width:100px; text-align:center;" |<math>ms^{-1}</math>
|-
| style="height:20px; width:300px; text-align:center;" |Planck's Constant
| style="height:20px; width:50px; text-align:center;" |<math>h</math>
| style="height:20px; width:100px; text-align:center;" |<math>6.63\times10^{-34}</math>
| style="height:20px; width:100px; text-align:center;" |<math>Js</math>
|-
| style="height:20px; width:300px; text-align:center;" |Boltzman Constant
| style="height:20px; width:50px; text-align:center;" |<math>k</math>
| style="height:20px; width:100px; text-align:center;" |<math>1.38\times10^{-23}</math>
| style="height:20px; width:100px; text-align:center;" |<math>JK^{-1}</math>
|}
===Meaning===
A '''physical constant''' is a quantity which is believed to have the same value at all points in space and time.
===About Physical Constants===
: '''Physical constants''' are found through [[measure]]ment and therefore carry a level of [[uncertainty]] in their values. As a result much time is spent by [[physicist]]s to reduce that [[uncertainty]] with more [[precise]] and [[accurate]] [[measure]]ments.
: The '''physical constants''' you should know of, but do not need to memorise are:
{| class="wikitable"
|-
| style="height:20px; width:300px; text-align:center;" |'''Physical Constant'''
| style="height:20px; width:50px; text-align:center;" |Symbol
| style="height:20px; width:100px; text-align:center;" |Value
| style="height:20px; width:100px; text-align:center;" |Units
|-
| style="height:20px; width:300px; text-align:center;" |Elementary Charge
| style="height:20px; width:50px; text-align:center;" |<math>e</math>
| style="height:20px; width:100px; text-align:center;" |<math>1.60\times10^{-19}</math>
| style="height:20px; width:100px; text-align:center;" |<math>C</math>
|-
| style="height:20px; width:300px; text-align:center;" |Rest Mass of a Proton
| style="height:20px; width:50px; text-align:center;" |<math>m_p</math>
| style="height:20px; width:100px; text-align:center;" |<math>1.67\times10^{-27}</math>
| style="height:20px; width:100px; text-align:center;" |<math>kg</math>
|-
| style="height:20px; width:300px; text-align:center;" |Rest Mass of a Neutron
| style="height:20px; width:50px; text-align:center;" |<math>m_n</math>
| style="height:20px; width:100px; text-align:center;" |<math>1.68\times10^{-27}</math>
| style="height:20px; width:100px; text-align:center;" |<math>kg</math>
|-
| style="height:20px; width:300px; text-align:center;" |Rest Mass of an Electron
| style="height:20px; width:50px; text-align:center;" |<math>m_e</math>
| style="height:20px; width:100px; text-align:center;" |<math>9.11\times10^{-31}</math>
| style="height:20px; width:100px; text-align:center;" |<math>kg</math>
|-
| style="height:20px; width:300px; text-align:center;" |Gravitational Constant
| style="height:20px; width:50px; text-align:center;" |<math>G</math>
| style="height:20px; width:100px; text-align:center;" |<math>6.67\times10^{-11}</math>
| style="height:20px; width:100px; text-align:center;" |<math>Nm^2kg^{-1}</math>
|-
| style="height:20px; width:300px; text-align:center;" |Permittivity of Free Space
| style="height:20px; width:50px; text-align:center;" |<math>\varepsilon_0</math>
| style="height:20px; width:100px; text-align:center;" |<math>8.85\times10^{-12}</math>
| style="height:20px; width:100px; text-align:center;" |<math>Fm^{-1}</math>
|-
| style="height:20px; width:300px; text-align:center;" |Permeability of Free Space
| style="height:20px; width:50px; text-align:center;" |<math>\mu_0</math>
| style="height:20px; width:100px; text-align:center;" |<math>4\pi\times10^{-7}</math>
| style="height:20px; width:100px; text-align:center;" |<math>Hm^{-1}</math>
|-
| style="height:20px; width:300px; text-align:center;" |Speed of Light in Free Space
| style="height:20px; width:50px; text-align:center;" |<math>c</math>
| style="height:20px; width:100px; text-align:center;" |<math>3.00\times10^{8}</math>
| style="height:20px; width:100px; text-align:center;" |<math>ms^{-1}</math>
|-
| style="height:20px; width:300px; text-align:center;" |Planck's Constant
| style="height:20px; width:50px; text-align:center;" |<math>h</math>
| style="height:20px; width:100px; text-align:center;" |<math>6.63\times10^{-34}</math>
| style="height:20px; width:100px; text-align:center;" |<math>Js</math>
|-
| style="height:20px; width:300px; text-align:center;" |Boltzman Constant
| style="height:20px; width:50px; text-align:center;" |<math>k</math>
| style="height:20px; width:100px; text-align:center;" |<math>1.38\times10^{-23}</math>
| style="height:20px; width:100px; text-align:center;" |<math>JK^{-1}</math>
|}