Abarometer measures the pressure of the atmosphere at different altitudes. identify the location where the column of mercury is lowest in the barometer.

Explanation:

At very high altitudes of Earth's atmosphere it is observed that the column of mercury is lowest.

As we move at high altitudes in the atmosphere there is less overlying mass as a result the atmospheric pressure decreases.

Thus, it can be concluded that the column of mercury is lowest in the barometer at very high altitudes of atmosphere.

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