19,879
edits
Changes
no edit summary
: [[Water]] can exist as a [[liquid]] and a [[gas]] at 100[[°C]]. The [[Kinetic Energy Store|kinetic energy]] of the [[particle]]s in both is the same. However, the [[particle]]s in [[steam]] have more '''internal energy''' than the [[particle]]s in [[water]] because they are spread apart, giving them more [[Potential Energy|potential energy]].
: The [[particle]]s in [[petrol]] at 50[[°C]] are moving around so they have [[Kinetic Energy Store|kinetic energy]]. The [[petrol]] also has a store of [[Chemical Potential Energy|chemical potential energy]] that can be released when [[petrol]] burns in the presence of [[Oxygen]]. So the '''Internal Energy''' of [[petrol]] includes both the [[Kinetic Energy Store|kinetic energy]] of the [[particle]]s and the [[Chemical Potential Energy|chemical potential energy]].
==Key Stage 4==
===Meaning===
[[Internal Energy]] is the [[Sum (Maths)|sum]] of all [[Kinetic Energy Store|kinetic]] and [[Potential Energy|potential energies]] of [[particle]]s in a [[system]].
===About Internal Energy===
: The [[particle]]s in a [[material]] have [[Kinetic Energy Store|kinetic energy]], because they move, and several types of [[Potential Energy|potential energy]] because there are [[force]]s between [[adjacent]] [[particle]]s.
: [[Force]]s of [[attraction]], including [[Chemical Bond|chemical bonds]], pull [[particle]]s together. The further apart the [[particle]]s the more [[Potential Energy|potential energy]] they poses. As a result the [[gas]]eous [[State of Matter|state]] of a [[substance]] has more [[Potential Energy|potential energy]] than the [[liquid]] [[State of Matter|state]] of that [[substance]], even if the [[temperature]] of both is the same because the [[particle]]s are spread apart in a [[gas]] and close together in a [[liquid]].