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Η υπέρυθρη ηλεκτρομαγνητική ακτινοβολία είναι το μη ορατό φως με μήκος κύματος από 700 νανόμετρα έως 1 χιλιοστό και συχνότητες από 300 GHz έως 430 THz.
Ο ήλιος μας παράγει τεράστιες ποσότητες υπέρυθρης θερμικής ακτινοβολίας που δεν μπορούμε να δούμε αλλά μπορούμε να νιώσουμε όταν μας θερμαίνει.