sentences: particles in a liquid are slower than particles in a gas
docs: liquid has weaker_internal_forces_than_solid liquid_gas is gas. pus is liquid. liquid_water is denser_than_air. gas has weaker_internal_forces_than_liquid scientists has discovered_particles_far_smaller_than_atoms liquid_methane is liquid. liquid is liquid. liquid is not_gas. fresh_water_particle is particle.