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

the ideal gas law equation is as follows

pv = nrt

where p - pressure

v - volume

n - number of moles

r - universal gas constant

t - temperature

so if the pressure, volume and temperature are already known

we are left with n and r

since r is the universal gas constant that has a known fixed value then r too is known

so we are left with 'n'

once we know temperature volume and pressure

we can find the number of moles of gas present using the ideal gas law equation

this is not my own answer, this is an answer for the same question by the user blahblahmali. i do not claim ownership of this account.

a gas, having a molecular weight of 13 kg/kmol and a kinematic viscosity of 0.25 cm2/s, flows through a pipe 0.25 m internal diameter and 5 km long at the rate of 0.4 m3/s and is delivered at atmospheric pressure.