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A unit cross-section, as defined by the SI system of measurement, is 1 metre2. So a column of air is all the air in a vertical column whose cross sectional area is 1 m2. The exact shape of the cross section is not defined but it is normally circular or a square.

A unit cross-section, as defined by the SI system of measurement, is 1 metre2. So a column of air is all the air in a vertical column whose cross sectional area is 1 m2. The exact shape of the cross section is not defined but it is normally circular or a square.

A unit cross-section, as defined by the SI system of measurement, is 1 metre2. So a column of air is all the air in a vertical column whose cross sectional area is 1 m2. The exact shape of the cross section is not defined but it is normally circular or a square.

A unit cross-section, as defined by the SI system of measurement, is 1 metre2. So a column of air is all the air in a vertical column whose cross sectional area is 1 m2. The exact shape of the cross section is not defined but it is normally circular or a square.

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11y ago

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