Sound particles, or more accurately, sound waves, do not obey gravity because they are not physical particles like atoms or objects. Sound is a form of energy that propagates through a medium, such as air, water, or solids, in the form of waves.
Gravity is a force that acts on physical particles with mass. It pulls objects towards the center of the Earth or any other massive body. However, sound waves are composed of alternating compressions and rarefactions of the medium they travel through. They transmit energy by causing particles in the medium to vibrate back and forth, transferring the energy from one particle to the next.
Since sound waves are not made up of particles with mass, they are not affected by gravity in the same way as physical objects. Gravity does not alter the speed or direction of sound waves as they propagate through a medium. Sound waves travel in all directions, including upward, downward, or horizontally, depending on the source of the sound and the medium through which it travels.
It is important to note that while sound waves themselves are not influenced by gravity, the medium through which they propagate can be affected. For example, if the medium is air, which is subject to gravity, the density and pressure of the air may change with altitude due to the gravitational force. These changes in the medium can indirectly affect the propagation of sound waves, but the sound waves themselves are not directly influenced by gravity.