unit water quantity

The low-density could be interpreted as less DNA quantity and more water per unit volume.

其实质是单位体积内DNA含量少和含水量高；

Quantity of water vapour in unit volume of air.

在单位容积内的水气数量.

Through the research of factors affecting the quantity of water flow in cracks, the authors plot the relation curve between unit water flow and width of crack and obtain the time and the width of cracks which maybe lead to the self-heal of concrete cracks.

通过对混凝土裂缝渗水量影响因素的研究，确定了单位渗水量与裂缝宽度等的关系曲线，以及混凝土裂缝可能产生自愈合的时间及裂缝宽度；

Humidity: Quantity of water vapour in unit volume of air.

湿度: 在单位容积内的水气数量.

The sour water tank in the stripping unit normally has a dome roof, a great quantity of pungent odorizing gas containing ammonia diffusing from the top of the tank, which pollutes environment and impact on the human health.

污水汽提装置酸性水罐一般为拱顶罐，罐顶散发大量含硫、含氨等恶臭气体，污染周围环境和影响人体健康。