sentences: less dense liquids float on liquids that are more dense
docs: liquid_water is 800_times_denser_than_air. gases is more_compressible_than_liquids_or_solids. pool_water is liquid. floating_in_liquid is floating. hold_liquids is contain_liquids. liquid is fluid. liquid is more_common_word_than_fluid. liquid_water is denser_than_air. liquid_concrete is liquid. liquid is liquid.