One atmosphere at sea level is equivalent to 760 millimeters of mercury.

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Multiple Choice

One atmosphere at sea level is equivalent to 760 millimeters of mercury.

Explanation:
One atmosphere at sea level is defined by the height of a mercury column it can support, which is 760 millimeters. That means the standard atmospheric pressure can be expressed directly as a mercury column of 760 mm tall, so the same pressure is described in the mmHg unit as 760 millimeters of mercury. This is the exact expression the question is asking for, making it the best choice. It's also helpful to know that this same pressure can be written in other units: 101.325 kilopascals or 1 atmosphere (in atmospheres) or 760 torr. The other options are correct representations in those different units, but they don’t provide the equivalent in millimeters of mercury, which is what the question asks.

One atmosphere at sea level is defined by the height of a mercury column it can support, which is 760 millimeters. That means the standard atmospheric pressure can be expressed directly as a mercury column of 760 mm tall, so the same pressure is described in the mmHg unit as 760 millimeters of mercury. This is the exact expression the question is asking for, making it the best choice.

It's also helpful to know that this same pressure can be written in other units: 101.325 kilopascals or 1 atmosphere (in atmospheres) or 760 torr. The other options are correct representations in those different units, but they don’t provide the equivalent in millimeters of mercury, which is what the question asks.

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