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DILATATION SURFACIQUE
Matériel didactique : Craies de couleur
Objectif opérationnel : A la fin de la leçon, l'élève sera capable de définir cette dilatation et d'expliquer ses multiples formules.

Rappel

Un fil de cuivre a une longueur de 1 m à 0°C. Que doit être sa température pour qu'il s'allonge de 10 m (l = 17 10-6)?

Rappel

Un fil de cuivre a une longueur de 1 m à 0°C. Que doit être sa température pour qu'il s'allonge de 10 m (l = 17 10-6)?

Motivation

Citez une dilatation que vous connaissez

Motivation

Il y a  la dilatation surfacique.

Annonce du Sujet

Qu'allons-nous étudier aujourd'hui ?

Annonce du Sujet

Aujourd'hui, nous allons étudier la dilatation surfacique.

Analyse : La dilatation

Définir la dilatation surfacique.

Prenons quelques exemples.

Analyse : La dilatation

Définition

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

Ainsi ∆S = S0 ẟ∆Ɵ

Donnez la formule générale :

St = S0 (1+ ẟ∆Ɵ)

Le coefficient de dilatation surfacique est :

 

La glace d'une vitrine est un rectangle de 9,6 m2 et d'épaisseur faible.

Calculez l'accroissement de surface qui accompagne une élévation de la température de 150°C à 35°C

Prendre ẟ = 18 10-6

Solution 

S0 = 9,6 m2 

ẟ = 18 10-6

∆S = 9,6.18 10-6.20

= 3,46 10-6 m2

∆t = 35-15 = 20°C

Qu'est-ce qu'une dilatation surfacique?

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

8.1.28PHP Version145msRequest Duration6MBMemory UsageGET lessons/{id}/{slug}Route
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    • Application (106ms)
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