IEVref: 561-06-08 ID: Language: en Status: Standard Term: coefficient of linear thermal expansion Synonym1: Synonym2: Synonym3: Symbol: α Definition: relative change in length due to a change in thermodynamic temperature divided by the change in temperature $\alpha =\frac{{l}_{T}–{l}_{\text{ref}}}{{l}_{\text{ref}}\left(T–{T}_{\text{ref}}\right)}$ where lT is the length at temperature T; lref is the length at reference temperature Tref Note 1 to entry: The coefficient of linear thermal expansion is generally expressed in megakelvins to the power minus one (1/MK). Publication date: 2016-07 Source: Replaces: 561-06-08:2014-11 Internal notes: CO remarks: TC/SC remarks: VT remarks: Domain1: Domain2: Domain3: Domain4: Domain5: