Sound, as a phenomenon, does not have measurable mass. Sound is the result of vibrations propagating through a medium, such as air or water. These vibrations are disturbances that transmit energy, but they do not possess mass themselves.
When sound waves pass through a medium, they cause particles in the medium to vibrate, transferring energy from one particle to another. However, this transfer of energy does not involve the creation or destruction of particles, so there is no change in mass.
As for human thought, it is a complex cognitive process that involves various electrical and chemical signals within the brain. While thoughts are associated with brain activity, they do not have measurable mass on their own. The processes involved in generating thoughts are primarily based on the movement of electrical impulses and the release of neurotransmitters, which do not contribute to a significant change in mass.