if a container contains a substance with less density than air then that container may move upward
food_vessel is not container_product. container has not smaller_object container is not instrumentality. food_storage_container is not food_vessel. container is not bigger_than_things_in. food_storage_container is food_vessel. container is bigger_than_things_in. non_fluidlike_substance is container_independent_shape. container_independent_shape is not finite_spatial_thing. transport_container is not container_product.