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==Key Stage 3==
===Meaning===
To '''compress''' is to make something shorter or smaller in [[Volume (Space)|volume]] by applying a [[force]].
===About Compression===
==Key Stage 4==
===Meaning===
To '''compress''' is to make something shorter of smaller in [[Volume (Space)|volume]] by applying a [[force]].
===About Compression===
: [[Gas]] can be '''compressed''' easily but [[solid]]s and [[liquid]]s cannot be '''compressed''' because the [[particle]]s in a [[solid]] and [[liquid]] are already touching.
: A [[Coil Spring|spring]] can be '''compressed''' to become shorter due to pair of [[Equilibrium Force|equilibrium forces]].