An instrument called a is used to measure the volume of air that moves into and out of the lungs.
a. hydrometer
b. barometer
c. spirometer
d. none of the above

Which lists the amplitudes of sound waves from these sources in order from greatest to least? busy roadway, kids whispering, average home chainsaw, diesel truck, rustling leaves kids whispering, vacuum cleaner, jet airplane library, conversational speech, music from speaker