Last Updated
：2025/11/22
column density
（ plural ）
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The total amount per unit area of a material suspended in a fluid or in a cloud in space, measured along the length of a column.
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column density
Astronomers calculated the column density along several lines of sight to estimate how much gas and dust lies between Earth and distant quasars.
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Astronomers calculated the column density along several lines of sight to estimate how much gas and dust lies between Earth and distant quasars.
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