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4-cours rayonnement

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Corps métallique m tallique<br />

à 20 °C<br />

Fer poli<br />

Fer oxydé oxyd<br />

Aluminium poli<br />

Aluminium oxydé oxyd<br />

Ordres de grandeur<br />

émissivit missivité<br />

0,15<br />

0,7<br />

0,05<br />

0,4<br />

Corps non métallique m tallique<br />

graphite<br />

papier<br />

bois<br />

Peinture brillante<br />

Tungstène Tungst ne<br />

incandescent<br />

émissivit missivité<br />

1<br />

0,9<br />

O,8<br />

O,3<br />

0,97<br />

31

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