Comment produit-on l'acide citrique ?

Comment produit-on l'acide citrique ?

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Rediffusion - Pourquoi certains animaux ont-ils des pupilles rectangulaires ?

Les pupilles des animaux présentent une grande variété de formes, allant des cercles aux fentes, en passant par les rectangles. Les pupilles rectangulaires, visibles chez des animaux comme les moutons, les chèvres ou certains amphibiens, jouent un rôle crucial dans leur survie ...

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Rediffusion - Pourquoi les flammes se dirigent-elles toujours vers le haut ?

Les flammes se dirigent toujours vers le haut en raison de plusieurs phénomènes physiques liés à la gravité, à la densité des gaz et à la dynamique des fluides.

 

Une flamme est le résultat d’une combustion, un processus chimique où un combustible (comme le bo ...

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