Hello Molly, Science Master here. Lets’ check that we understand how sound is produced and what it is. Sound is a form of Energy ( see Science Master Special). It is transmitted by particles hitting each other.
So what do you think? Could you hear the sound underwater? Could you hear the sound further along the metal tube?
Lets improve the experiment by making it fairer. How could we do this?
Let us look at the particle arrangement in the air, water and metal.
The average distance between particles for a gas is 4 nanometers (1 nanometer = 10-9 meters), for a liquid it is 0.2 of a nanometer and for the solid 0.0002 of a nanometer.
So. If the first line of particles in the gas starts moving it has to travel 4 nanometers before it hits the second row. For the liquid this would be a smaller distance and for the metal it would be hardly any distance. What does that tell you about the speed of travel of sound?
Does your experiments support your thoughts? Maybe it needs to be modified? How could you modify it to really test your thoughts.
Just a thought of my own. The sound source (drum, spoon tapping, violin) gives the particles around it ENERGY. Those particles in air have to travel a long distance before they hit another particle and pass the sound on. All this time they are losing ENERGY. For the metal the particles only have to travel a little way before passing on the vibration.
Not sure of something Lilly…ask another question.
(Anyone reading this post who wants to ask a question or make a comment please feel free to do so)