Question

Two instruments used to measure air pressure are the mercury barometer and the blank

Answer 1

Explanation:

Barometers come in two basic forms: the aneroid barometer and the mercury barometer. Aneroid barometers use cells that expand and contract as air pressure changes.

Answer 2

Explanation:

Is that a question, I doubt

Nevermind

The aneroid barometer and the mercury barometer are two parts