equation aux dimensions pdf


Comment utiliser l’équation aux dimensions ?

Une charge électrique Q : ……………………………………………………… La masse volumique ? : ………………………………………………………… Utilisation de l’équation aux dimensions On ne peut additionner entre elles que des grandeurs ayant la même dimension. Conséquence : Si dans une équation les dimensions des grandeurs dont on fait la somme ne sont pas identiques, cette équation est fausse.

Comment calculer les dimensions d'une équation?

Ou encore, sous forme d'une équation aux dimensions : Ce dont on peut déduire que a + b + c = 1 et a + b + 2 c = 0, dont on peut déduire que c = -1, mais deux exposants restent indéterminés. C'est normal, puisqu'il y a deux grandeurs indépendantes et quatre quantités pour une seule équation.

Comment calculer la dimension d'un volume ?

Exemple: si V désigne un volume [V] désigne la dimension du volume V 2 Propriétés : équation aux dimensions a) A et B étant des grandeurs physiques, si A=B + C alors [A]=[B]=[C]. b) A et B étant des grandeurs physiques, si B=1/A alors [B]=[A]-1.

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