Why is it das Rauschen?

Rauschen is the verb rauschen used as a noun, and verbs used as nouns are always neuter: das Rauschen.

More verbs used as nouns
Sense 1
das

Meaning

[1] Technology: irregular acoustic signal from an infinite number of partial vibrations

[1] Technik: unregelmäßiges akustisches Signal aus unendlich vielen Teilschwingungen

Examples

[1] The noise of the sea can be very calming

[1] Das Rauschen des Meeres kann sehr beruhigend sein.

Declension

1 Singular Plural
Nominativ das Rauschen —
Genitiv des Rauschens —
Dativ dem Rauschen —
Akkusativ das Rauschen —

Pronunciation

Dictionary entries include material from Wiktionary. Wiktionary