11 Masse volumique du polystyrène
Le polystyrène est un matériau plastique
transparent dont...
![subject](/tpl/images/cats/fizika.png)
Physics, 19.10.2021 21:10 irabrooks14
11 Masse volumique du polystyrène
Le polystyrène est un matériau plastique
transparent dont on fait par exemple
certains gobelets. Si l'on y souffle
un gaz lors de sa fabrication, on
obtient du polystyrène expansé,
sous forme de boules blanches.
1. La boule de polystyrène expansé
de la photographie a un diamètre de
12 cm. Calculer son volume.
2. La masse de cette boule est de 14 g.
Calculer la masse volumique du polystyrène expansé.
3. Si l'on immerge totalement un gobelet en polystyrène
dans l'eau, il coule. Est-ce que, comme lui, cette boule
coulerait ? Justifier.
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