We know the pressure is equal to force per area.
我们知道压强等于力除以面积。
There were significant differences in both area and per area between two groups (P<0.05).
两组的牙本质小管面积和相对面积有显著性差异（P<0.05）。
The filter pack provides more filtration media per area, leading to more efficient filtration.
该过滤包在单位面积上可提供更多的过滤介质，并因此产生更高效的过滤。
The results show that the minimum laser specific energy, the maximum cladding thickness and the contact angle have a linear relationship with the maximum powder density per area.
结果表明，最小激光比能、最大熔覆层厚度、接触角均与最大粉末面密度呈线性关系；
According to physics performance of two melts, this paper determines the explosive welding window, then obtaines the maximium and the minimium value of explosive weight on per area.
根据两种材料的物理性质确定爆炸焊接窗口，从而确定单位面积药量的最大值和最小值。
According to physics performance of two melts, this paper determines the explosive welding window, then obtaines the maximium and the minimium value of explosive weight on per area.
根据两种材料的物理性质确定爆炸焊接窗口，从而确定单位面积药量的最大值和最小值。
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