Sound energy is produced by vibrating objects.
Example: when you speak you vibrate the air molecules in the air. If you where to speak in space no “sound” would be produced since there is nothing for the vibration of your voice to travel through.
D have the same opinion on the contain resisting
2.7 L in cm³ :
2.7 * 1000 = 2700 cm³
Weight = Volume * Density
2700 * 0.79 = 2133 g
1 Ibs = <span>453.59 g
2133 / 453.59 = 4.70 Ibs
hope this helps!</span>
