Sea level pressure is the weight of the entire column of the atmosphere from sea level to the top of the atmosphere for a unit area, which is equal to the weight of a column of mercury with the height of approximately

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The question asks: Sea level pressure is the weight of the entire column of the atmosphere from sea level to the top of the atmosphere for a unit area, which is equal to the weight of a column of mercury with the height of approximately

Options:
- 30 inches
- 20 inches
- 10 inches
- 50 inches

To approach this, recall that standard sea-level atmospheric pressure is about 1013.25 hPa, which corresponds to a mercury column of roughly 760 millimeters. Converting 760 mm to inches gives about 29.9 inches, commonly rounded to 30 inches. Therefore, the approximate mercury column height that represents sea-level pressure is around 30 inches.

Option 1: 30 inches — This aligns with the well-established standard value; it correctly represents the approximate height of a mercury column corresponding to sea-level pressure.

Option 2: 20 inches — This is too short to represent standard sea-level pressure; a much greater height is required for 1013 hPa, so this underestimates the pressure.

Option 3: 10 inches — Even more underestimated; a column of mercury this short would correspond to far lower atmospheric pressure, not the standard sea-level value.

Option 4: 50 inches — This overestimates the typical sea-level pressure; while mercury column heights vary with weather and measurement units, 50 inches greatly exceeds the standard ~30 inches for sea level.

In summary, the correct approximate mercury column height for sea-level pressure is about 30 inches, while the other options deviate significantly from the standard value due to underestimation or overestimation of the atmospheric pressure represented by a mercury column.

CLMTGR5001_002_2025_3 - Dynamics of Climate Variability and Chan PRACTICE QUIZ: Week 3 Lecture 2.2

Sea level pressure is the weight of the entire column of the atmosphere from sea level to the top of the atmosphere for a unit area, which is equal to the weight of a column of mercury with the height of approximately

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