A whisper is quiet, a normal conversation is louder, and a jet engine is painfully loud.

The longer version

Measured levels span a wide stretch: a whisper sits near the bottom of comfortable hearing, ordinary speech sits several tens of units above it, and the noise close to a large jet engine sits near the point where pressure becomes painful and damaging. Room noise, traffic and machinery fall between those anchors, and each step upward multiplies energy.

Because the scale is logarithmic, the gap between a whisper and speech is not a small multiple of energy but a large one, even though both feel ordinary. Sustained exposure near the top of that range injures the inner ear within minutes, which is why ground crews wear protection.

Where this entry sits

Sound and Music gathers facts about how vibrations move through air and water, how ears turn them into meaning, and how instruments and notation shape what listeners hear. Expect echoes, pitch, volume, acoustics, and the odd silence in between. The full list sits on the Sound and Music page, where every entry is listed in order.