There’s a radially symmetric blob, and a double-lobed blob with a node in the middle – just like the patterns of electron density that the s and p atomic orbitals give rise to.

右图中的球是围绕碳原子的电子云的图像。 它们分别是径向对称的球和中间有节点的双扁球形状，就像s和p原子轨道给出的电子密度图。

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That usually doesn't reach sub-atomic resolution, but if the tip itself is atomically thin, you can work out a picture of electron density around it.

因此他不能达到亚原子水平的分辨率，但是如果针尖能够做到原子那么厚，就可以得到围绕原子内的电子密度。

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The atomic density and velocity distribution in the laser excitation zone is very important for the atomic vapor laser isotope separation (AVLIS).

在激光同位素分离中，激光作用区内原子的密度和速度分布对分离过程有重要影响。

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Gamma-ray emitters bounce atomic particles off rock formations to see the size, density and flow of oil reservoirs.

FORBES: Magazine Article

The company has tweaked the chemical and atomic composition of the raw materials of the glass, which in turn has increased its density -- making it much more scratch and dent resistant than last years model.

ENGADGET: Corning demonstrates how strong its Gorilla Glass 3 really is (video)