if a container contains a substance with less density than air then that container may move upward
non_fluidlike_substance is container_independent_shape. vessel is container. shipping_container is storage_device. transport_container is container_product. food_storage_container is food_vessel. container is bigger_than_things_in. container is container_shaped_object. food_vessel is container_product. container_independent_shape is finite_spatial_thing. container has smaller_object