if the particles are closer to each other, then the vibrations of particles will travel faster
escape_velocity is speed. photons is not both_particles_and_waves. terminal_velocity is not speed. gravitational_waves is not ripples_in_fabric_of_space_time. photons is both_particles_and_waves. gravitational_waves is ripples_in_fabric_of_space_time. angular_velocity is speed. scientists has discovered_particles_far_smaller_than_atoms angular_velocity is not speed. escape_velocity is not speed.