( ( According ( to ( ( the ( kinetic theory ) ) ( of gases ) ) ) ) ( , ( ( ( the temperature ) ( of ( a gas ) ) ) ( ( ( is just ) ( ( a measure ) ( of ( ( the ( average ( kinetic energy ) ) ) ( of ( ( the particles ) ( in ( that gas ) ) ) ) ) ) ) ) . ) ) ) )
(ROOT (S (PP (VBG According) (PP (TO to) (NP (NP (DT the) (JJ kinetic) (NN theory)) (PP (IN of) (NP (NNS gases)))))) (, ,) (NP (NP (DT the) (NN temperature)) (PP (IN of) (NP (DT a) (NN gas)))) (VP (VBZ is) (ADVP (RB just)) (NP (NP (DT a) (NN measure)) (PP (IN of) (NP (NP (DT the) (JJ average) (JJ kinetic) (NN energy)) (PP (IN of) (NP (NP (DT the) (NNS particles)) (PP (IN in) (NP (DT that) (NN gas))))))))) (. .)))
According to the kinetic theory of gases, the temperature of a gas is just a measure of the average kinetic energy of the particles in that gas.
(ROOT (S (PP (IN In) (NP (NN physics))) (, ,) (NP (NN temperature)) (VP (VBZ is) (VP (VBN defined) (PP (IN as) (NP (NP (DT the) (JJ average) (JJ kinetic) (NN energy)) (PP (IN of) (NP (NP (DT the) (NNS particles)) (PP (IN in) (NP (DT an) (NN object))))))))) (. ?)))