mechanism, or type of heat transport, in which the fluid motion is not generated by any external source, but only by density differences in the fluid occurring due to temperature gradients
自然对流是没有外界但流体依然存在运动的情况，引起这種對流的内在力量是温度差或者（的）浓度差。自然對流常在地球大氣層和海洋發生。
Abstract from DBpedia / Wikipedia · CC BY-SA
Discovered by embedding cosine similarity (sentence-transformers MiniLM, 384-dim).