1000 3 0.25 m 0.33 m 330 m/s 0.001 m 1000 0.07 m 0.28 m 280 m/s 0.001 m Average 216.095 m/S List possible Not calculating to the smallest unit of measurement = millimeter, could error sources provide more accuracy. Not everyone perceives sound the same.. say due to an injury or old age. That may have an impact on where the change in sound occurs. Water temperature, air temperature and altitude are all factors that will change the results. Ocular parallax can affect the visual reading of the cylinder. Position of the sound making device to the tube opening could have an effect