我国古代劳动人民在浮力的应用方面有许多发明创造,有些在世界上居领先地位,下面仅就我国古代对水的浮力的应用作一论述。在征服自然中发现和应用水的浮力我们知道,比重小于水的物体能够被水浮起,大于水的就要下沉。这是一个重要的自然规律。我国古代人民通过长期观察发现了树叶、树枝甚至树干等落在水上浮而不沉的现象,因而便利用现成的树干浮在水上以渡水或劳动。这可能是水的浮力的最早应用。在古代有“古 The ancient working people in our country have many inventions and innovations in the application of buoyancy and some are in the leading position in the world. Here we only discuss the application of the buoyancy of water in ancient China. Discovering and Applying Water Buoyancy in Conquering Nature We know that objects with a smaller specific gravity than water can float by water and sink more than water. This is an important natural law. Through the long-term observation, ancient people in our country found that leaves, branches and even tree trunks fall on the water instead of sinking. Therefore, the ready-made tree trunk floats on the water to ferry water or work. This may be the earliest application of water buoyancy. In ancient times ”ancient