n.密度；浓度；比重

Mercury has a much greater density than water. 水银的密度比水大得多。

The driver had to stop because the density of the fog made it difficult to see. 由於浓雾使道路很难看清,司机不得不停车。

The next trail would require a slightly higher filling density acid. 在下一次试验时需要注入比重较高的酸。

The bicapillary pycnometer is a tool for accurate determination of density. 双毛细管比重瓶是一种用于精确测量液体密度的仪器。