( ( ( Thermal expansion ) ( is ( ( ( the tendency ) ( of matter ) ) ( to ( ( change ( in ( volume ( in response ) ) ) ) ( to ( ( a change ) ( in temperature ) ) ) ) ) ) ) ) ( , ( ( At ( the ( glass ( transition temperature ) ) ) ) ( , ( ( rearrangements ( that ( occur ( in ( an ( amorphous material ) ) ) ) ) ) ( ( lead ( to ( ( characteristic discontinuities ) ( of ( coefficient ( of ( ( ( thermal expansion ) or ) ( specific heat ) ) ) ) ) ) ) ) . ) ) ) ) ) )
(ROOT (S (NP (NP (JJ Thermal) (NN expansion)) (SBAR (S (VP (VBZ is) (NP (NP (DT the) (NN tendency)) (PP (IN of) (NP (NN matter))) (S (VP (TO to) (VP (VB change) (PP (IN in) (NP (NP (NN volume)) (PP (IN in) (NP (NN response))))) (PP (TO to) (NP (NP (DT a) (NN change)) (PP (IN in) (NP (NN temperature))))))))))))) (, ,) (PP (IN At) (NP (DT the) (NN glass) (NN transition) (NN temperature))) (, ,) (NP (NP (NNS rearrangements)) (SBAR (WHNP (WDT that)) (S (VP (VBP occur) (PP (IN in) (NP (DT an) (JJ amorphous) (NN material))))))) (VP (VBP lead) (PP (TO to) (NP (NP (JJ characteristic) (NNS discontinuities)) (PP (IN of) (NP (NP (NN coefficient)) (PP (IN of) (NP (NP (JJ thermal) (NN expansion)) (CC or) (NP (JJ specific) (NN heat))))))))) (. .)))
Thermal expansion is the tendency of matter to change in volume in response to a change in temperature, At the glass transition temperature, rearrangements that occur in an amorphous material lead to characteristic discontinuities of coefficient of thermal expansion or specific heat.
(ROOT (S (NP (DT The) (NN term) (JJ thermal) (NN expansion)) (VP (VBZ is) (VP (VBN used) (S (VP (TO to) (VP (VB describe) (NP (NP (DT the) (NN change)) (PP (IN in) (NP (NN size) (CC or) (NN volume))) (PP (IN of) (NP (NP (DT a) (VBN given) (NN mass)) (PP (IN with) (NP (NN temperature))))))))))) (. .)))