Define air pressure. Why does it always decrease with increasing height?, meteorology questions help

Please answer each question in 3-5 complete sentences. Responses are due Friday (November 4) by 11:59 P.M.

1. Define air pressure. Why does it always decrease with increasing height?

2. What is the highest elevation you have ever been to? Estimate the corresponding station pressure there (hints: air pressure drops 10 millibars for every 100 meters; 1 meter = 3.3 feet).

3. What is the general name of the instrument used to measure air pressure? Give two types and explain how each one works.

4. What are the names of the instruments used to measure wind direction and wind speed? How does each work? Is there an instrument that can be used to measure both of these atmospheric variables? Explain.

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also, u have to finish the upload files questions.