Why is it important to have a control? IN SCIENCESOUND CONTROL
P. S don't make it sound like ur a genius

it's important so sound transmits through vribrating air particles for example earbuds have small speakers but powerful. The wide design helps with the outside noise cancelation and comfort for the ear. <thats for buds (this is for headphones >). Headphones have a little bigger speaker's and the cushions like the bigger earbud designs it noise cancels and give better comfort.

P.S headphones aren't that comfortable after long periods of time

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.