Answer :

Final answer:

A vacuum gauge reads pressure in inches of mercury. Option A.

Explanation:

The correct answer is a) inches of mercury.

A vacuum gauge is a device used to measure the pressure in a vacuum. It typically uses a column of mercury to measure the pressure. The height of the mercury column in inches is used to indicate the pressure. Therefore, a vacuum gauge reads pressure in inches of mercury.

For example, if a vacuum gauge reads a pressure of 10 inches of mercury, it means that the pressure in the vacuum is equivalent to the weight of a 10-inch column of mercury.

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