Sound Intensity
uSound Source         Intensity (W/m2)
uCity traffic                                                        10-5
uNormal conversation at 1 m                          10-6
uOffice; Classroom; Quiet auto interior        10-7
uLibrary                                                              10-8
uEmpty auditorium; City street, no traffic    10-9
uWhisper at 1 m                                                10-10
uRustle of leaves; Falling pin                          10-11
uLimit of audibility                                           10-12