Question

A decrease in the height of a column in a mercury barometer means that _____. air pressure is increasing wind speed is increasing air pressure is decreasing air pressure is being deflected by the coriolis effect

Answer 1

Answer:

Correct answer is  air pressure is decreasing

Explanation:

Atmospheric pressure is usually measured with the help of  barometer. A barometer consist of  a glass tube in which there is a column of mercury. This column of mercury changes with the changing weight of the atmosphere. It means height of mercury column depend on air pressure.Height of  height of a column in a mercury barometer is directly proportional to atmospheric pressure.Therefore a decrease in the height of a column in a mercury barometer means that air pressure is decreasing.

Answer 2

I think it's "air pressure is decreasing".