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LA DILATATION THERMIQUE : DILATATION ET CONTRACTION DES SOLIDES
Matériel didactique : Tableau noir
Objectif opérationnel : A la fin de la leçon, l'élève sera capable de citer les principales applications de la dilatation et de calculer la variation des dimensions d'un solide.

Rappel

Convertir les températures ci-après :

- 30°C = ...°F

- 49°F = .. °C

- 2°C = ..°F

Rappel

Convertir les températures ci-après :

  • 30°C = 22 °F
  • 49°F = 45  °C
  • 2°C = 28,4°F

Annonce du Sujet

Aujourd'hui nous allons étudier la dilatation thermique.

Annonce du Sujet

Aujourd'hui nous allons étudier la dilatation thermique.

Analyse : La dilatation

 

Définir la dilatation

Comment comprenez-vous la contraction?

Analyse : La dilatation

La dilatation est une augmentation d'un corps sous l'action de la température.

Cependant en refroidissant le corps, la distance moyenne entre ses particules diminue et en conséquence le volume qu'elles occupent devient plus petit, c'est la contraction.

La dilatation que subit un corps dont la température varie dépend :

  • Des dimensions initiales
  • De la variation de température
  • De la nature du corps

Définir la dilatation linéaire

Quelle est la formule pour calculer la variation de longueur?

Donner la formule générale de dilatation linéaire

La dilatation linéaire des solides

Définition

La dilatation linéaire est l'accroissement de longueur que subit un corps sous l'effet de la variation de la température.

Formule

∆∟= Variation de longueur (m)

λ  = Coefficient de dilatation linéaire

/0 = Longueur initiale (m)

∆Ɵ = variation de température

          ∆Ɵ = t2 – t1

La formule Générale │t = │0 (1+λ ∆Ɵ)

1+λ∆Ɵ est le binôme de dilatation linéaire   

Qu'est-ce que nous venons d'étudier?

Nous venons d'étudier la dilatation et la contraction.

MessagesTimelineExceptionsViews7RouteQueries36Models48GateSessionRequest
8.1.28PHP Version132msRequest Duration6MBMemory UsageGET lessons/{id}/{slug}Route
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