{"id":114327,"date":"2022-02-04T00:38:46","date_gmt":"2022-02-03T23:38:46","guid":{"rendered":"https:\/\/material-properties.org\/methane-densite-capacite-thermique-conductivite-thermique\/"},"modified":"2022-03-22T09:01:33","modified_gmt":"2022-03-22T08:01:33","slug":"methane-densite-capacite-thermique-conductivite-thermique","status":"publish","type":"post","link":"https:\/\/material-properties.org\/fr\/methane-densite-capacite-thermique-conductivite-thermique\/","title":{"rendered":"M\u00e9thane – Densit\u00e9 – Capacit\u00e9 thermique – Conductivit\u00e9 thermique"},"content":{"rendered":"

\u00c0 propos du m\u00e9thane<\/h2>\n

Le m\u00e9thane, CH4, est un gaz incolore et inodore.\u00a0Il est \u00e9galement connu sous le nom de gaz des marais ou hydrure de m\u00e9thyle.\u00a0Les vapeurs sont plus l\u00e9g\u00e8res que l’air.\u00a0C’est un hydrure du groupe 14 et l’alcane le plus simple, et c’est le principal constituant du gaz naturel.\u00a0

<\/div>\"m\u00e9thane<\/a>
<\/div>\n

R\u00e9sum\u00e9<\/h3>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
Nom<\/td>\nM\u00e9thane<\/strong><\/td>\n<\/tr>\n
Phase \u00e0 STP<\/td>\ngazeux<\/strong><\/td>\n<\/tr>\n
Densit\u00e9<\/td>\n0,657 kg\/m3<\/sup><\/strong><\/td>\n<\/tr>\n
R\u00e9sistance \u00e0 la traction ultime<\/td>\nN \/ A<\/strong><\/td>\n<\/tr>\n
Limite d’\u00e9lasticit\u00e9<\/td>\nN \/ A<\/strong><\/td>\n<\/tr>\n
Module de Young<\/td>\nN \/ A<\/strong><\/td>\n<\/tr>\n
Duret\u00e9 Brinell<\/td>\nN \/ A<\/strong><\/td>\n<\/tr>\n
Point de fusion<\/td>\n-183 \u00b0C<\/strong><\/td>\n<\/tr>\n
Conductivit\u00e9 thermique<\/td>\n0,034 W\/mK<\/strong><\/td>\n<\/tr>\n
Capacit\u00e9 thermique<\/td>\n2200 J\/g\u00b7K<\/span><\/strong><\/td>\n<\/tr>\n
Prix<\/td>\n2 $\/kg<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
<\/div>\n

Densit\u00e9 du m\u00e9thane<\/h2>\n

Les densit\u00e9s typiques de diverses substances sont \u00e0 la pression atmosph\u00e9rique.\u00a0La densit\u00e9<\/strong><\/a> est d\u00e9finie comme la\u00a0masse par unit\u00e9 de volume<\/strong>. C’est une\u00a0propri\u00e9t\u00e9 intensive<\/strong>, qui est d\u00e9finie math\u00e9matiquement comme la masse divis\u00e9e par le volume: \u03c1 = m\/V<\/strong><\/p>\n

En d’autres termes, la densit\u00e9 (\u03c1) d’une substance est la masse totale (m) de cette substance divis\u00e9e par le volume total (V) occup\u00e9 par cette substance. L’unit\u00e9 SI standard est\u00a0le kilogramme par m\u00e8tre cube<\/strong> (kg\/m3<\/sup><\/strong>). L’unit\u00e9 anglaise standard est\u00a0la masse de livres par pied cube<\/strong> (lbm\/ft3<\/sup><\/strong>).<\/p>\n

La densit\u00e9 du m\u00e9thane est de\u00a00,657 kg\/m3<\/sup>.<\/strong><\/p>\n

<\/div>
\n<\/div><\/div>
\n

Densit\u00e9 des mat\u00e9riaux<\/h3>\n

\"Tableau<\/p>\n<\/div><\/div>

\n<\/div><\/div>
<\/div>\n

Propri\u00e9t\u00e9s thermiques du m\u00e9thane<\/h2>\n

M\u00e9thane – Point de fusion<\/h3>\n

Le point de fusion du m\u00e9thane est de -183\u00a0<\/strong>\u00b0C<\/strong>.<\/p>\n

Notez que ces points sont associ\u00e9s \u00e0 la pression atmosph\u00e9rique standard. En g\u00e9n\u00e9ral, la fusion<\/strong> est un changement de phase<\/strong> d’une substance de la phase solide \u00e0 la phase liquide. Le\u00a0point de fusion<\/strong> d’une substance est la temp\u00e9rature \u00e0 laquelle ce changement de phase se produit. Le\u00a0point de fusion <\/strong>d\u00e9finit \u00e9galement une condition dans laquelle le solide et le liquide peuvent exister en \u00e9quilibre.\u00a0Pour divers compos\u00e9s chimiques et alliages, il est difficile de d\u00e9finir le point de fusion, car il s’agit g\u00e9n\u00e9ralement d’un m\u00e9lange de divers \u00e9l\u00e9ments chimiques.<\/p>\n

M\u00e9thane – Conductivit\u00e9 thermique<\/h3>\n

La conductivit\u00e9 thermique du m\u00e9thane est de\u00a00,034\u00a0<\/strong>W\/(m\u00b7K)<\/strong>.<\/p>\n

Les caract\u00e9ristiques de transfert de chaleur d’un mat\u00e9riau solide sont mesur\u00e9es par une propri\u00e9t\u00e9 appel\u00e9e la conductivit\u00e9 thermique<\/strong>, k (ou \u03bb), mesur\u00e9e en W\/mK<\/strong>.\u00a0C’est une mesure de la capacit\u00e9 d’une substance \u00e0 transf\u00e9rer de la chaleur \u00e0 travers un mat\u00e9riau par\u00a0conduction<\/a>. Notez que\u00a0la loi de Fourier<\/strong><\/a>\u00a0s’applique \u00e0 toute mati\u00e8re, quel que soit son \u00e9tat (solide, liquide ou gazeux), par cons\u00e9quent, elle est \u00e9galement d\u00e9finie pour les liquides et les gaz.<\/p>\n

La conductivit\u00e9 thermique<\/strong><\/a> de la plupart des liquides et des solides varie avec la temp\u00e9rature.\u00a0Pour les vapeurs, cela d\u00e9pend aussi de la pression.\u00a0En g\u00e9n\u00e9ral:<\/p>\n

\"conductivit\u00e9<\/a><\/p>\n

La plupart des mat\u00e9riaux sont presque homog\u00e8nes, nous pouvons donc g\u00e9n\u00e9ralement \u00e9crire k = k (T)<\/em><\/strong>.\u00a0Des d\u00e9finitions similaires sont associ\u00e9es aux conductivit\u00e9s thermiques dans les directions y et z (ky, kz), mais pour un mat\u00e9riau isotrope, la conductivit\u00e9 thermique est ind\u00e9pendante de la direction de transfert, kx = ky = kz = k.<\/p>\n

M\u00e9thane – Chaleur sp\u00e9cifique<\/h3>\n

La chaleur sp\u00e9cifique du m\u00e9thane est de 22\u00a0<\/strong>00\u00a0<\/strong>J\/g K<\/strong>.<\/p>\n

La chaleur sp\u00e9cifique, ou capacit\u00e9 thermique sp\u00e9cifique,<\/strong>\u00a0est une propri\u00e9t\u00e9 li\u00e9e \u00e0\u00a0l’\u00e9nergie interne<\/a><\/strong> tr\u00e8s importante en thermodynamique. Les\u00a0propri\u00e9t\u00e9s intensives <\/strong>c<\/em><\/strong>v<\/sub><\/em><\/strong> et\u00a0c<\/em><\/strong>p<\/sub><\/em><\/strong> sont d\u00e9finies pour des substances compressibles pures et simples comme des d\u00e9riv\u00e9es partielles de l’ \u00e9nergie interne <\/strong>u(T, v)<\/em><\/strong> et de l’\u00a0enthalpie <\/strong>h(T, p)<\/em><\/strong>, respectivement:\u00a0<\/strong><\/p>\n

\"\"<\/a><\/p>\n

o\u00f9 les indices v<\/strong> et\u00a0p<\/strong> d\u00e9signent les variables maintenues fixes lors de la diff\u00e9renciation.\u00a0Les propri\u00e9t\u00e9s\u00a0cv<\/sub> <\/strong>et\u00a0cp<\/sub><\/strong> sont appel\u00e9es\u00a0chaleurs sp\u00e9cifiques <\/strong>(ou\u00a0capacit\u00e9s calorifiques<\/strong>) car, dans certaines conditions particuli\u00e8res, elles relient le changement de temp\u00e9rature d’un syst\u00e8me \u00e0 la quantit\u00e9 d’\u00e9nergie ajout\u00e9e par transfert de chaleur. Leurs unit\u00e9s SI sont\u00a0J\/kg K<\/strong> ou\u00a0J\/mol K<\/strong>.<\/p>\n

<\/div>
\n

Point de fusion des mat\u00e9riaux<\/h3>\n

\"Tableau<\/a><\/p><\/div><\/div>

\n

Conductivit\u00e9 thermique des mat\u00e9riaux<\/h3>\n

\"Tableau<\/a><\/p><\/div><\/div>

\n

Capacit\u00e9 calorifique des mat\u00e9riaux<\/h3>\n

\"Tableau<\/a><\/p>\n

<\/h3>\n<\/div><\/div>
<\/div>\n
\n

La r\u00e9sistance des mat\u00e9riaux<\/h3>\n

\"Tableau<\/a><\/p><\/div><\/div>

\n

\u00c9lasticit\u00e9 des mat\u00e9riaux<\/h3>\n

\"Tableau<\/a><\/p><\/div><\/div>

\n

Duret\u00e9 des mat\u00e9riaux<\/h3>\n

\"Tableau<\/a>\u00a0 <\/p><\/div><\/div>

<\/div>\n","protected":false},"excerpt":{"rendered":"

\u00c0 propos du m\u00e9thane Le m\u00e9thane, CH4, est un gaz incolore et inodore.\u00a0Il est \u00e9galement connu sous le nom de gaz des marais ou hydrure de m\u00e9thyle.\u00a0Les vapeurs sont plus l\u00e9g\u00e8res que l’air.\u00a0C’est un hydrure du groupe 14 et l’alcane le plus simple, et c’est le principal constituant du gaz naturel.\u00a0 R\u00e9sum\u00e9 Nom M\u00e9thane Phase … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4],"tags":[],"yoast_head":"\nM\u00e9thane | Densit\u00e9, capacit\u00e9 thermique, conductivit\u00e9 thermique<\/title>\n<meta name=\"description\" content=\"Le m\u00e9thane, CH4, est un gaz incolore et inodore. 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