Sound Intensity
	Sound Source             Intensity (W/m2) City traffic                                                        10-5 Normal conversation at 1 m                          10-6 Office; Classroom; Quiet auto interior        10-7 Library                                                              10-8 Empty auditorium; City street, no traffic    10-9 Whisper at 1 m                                                10-10 Rustle of leaves; Falling pin                          10-11 Limit of audibility                                           10-12