( ( ( Ignition Temperature ) ( ( ( The ( ignition ( ( -LRB- ( or ( autoignition -RRB- ) ) ) temperature ) ) ) ( of ( ( a substance ) ( -- ( ( ( solid ( , liquid ) ) ( , ( or gas ) ) ) -- ) ) ) ) ) ( is ( ( the ( minimum temperature ) ) ( required ( to ( initiate self ) ) ) ) ) ) ) ( - ( ( sustained combustion ) . ) ) )
(ROOT (FRAG (NP (NP (NNP Ignition) (NNP Temperature)) (SBAR (S (NP (NP (DT The) (NN ignition) (PRN (-LRB- -LRB-) (CC or) (ADJP (JJ autoignition)) (-RRB- -RRB-)) (NN temperature)) (PP (IN of) (NP (NP (DT a) (NN substance)) (PRN (: --) (UCP (ADJP (JJ solid) (, ,) (JJ liquid)) (, ,) (CC or) (NP (NN gas))) (: --))))) (VP (VBZ is) (NP (NP (DT the) (JJ minimum) (NN temperature)) (VP (VBN required) (S (VP (TO to) (VP (VB initiate) (NP (NN self))))))))))) (: -) (VP (VBD sustained) (NP (NN combustion))) (. .)))
Ignition Temperature The ignition (or autoignition) temperature of a substance -- solid, liquid, or gas -- is the minimum temperature required to initiate self- sustained combustion.
(ROOT (S (NP (NNS Gases) (CC and) (NNS liquids)) (VP (VBP become) (NP (NNS solids)) (PP (IN at) (NP (JJ low) (NNS temperatures)))) (. .)))
Gases and liquids become solids at low temperatures.