Question

Which phrases describe air pressure? Select three options.

Answer 1

• decreases as altitude increases
• results from a column of air pushing on an area
• decreases due to fewer air particles pushing down

Pressure is the force exerted, by a substance, per unit area.

Explanation:

Pressure is given by the formulae;

P = F/ A

Whereby;

P = pressure

F = Force

A = area

Remember that ..

F = Ma

Whereby;

F = Force

M = mass

a = acceleration

Therefore pressure can be given as;

P = Ma / A

The mass of the above column of a substance multiplied by the acceleration due to gravity = pressure exerted by the substance.

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Answer 2

Answer:

B) decreases as altitude increases

D) results from a column of air pushing on an area

E) decreases due to fewer air particles pushing down

Explanation:

Pressure is given by the formulae;

P = F/ A

Whereby;

P = pressure

F = Force

A = area

Remember that ..

F = Ma

Whereby;

F = Force

M = mass

a = acceleration

Therefore pressure can be given as;

P = Ma / A

The mass of the above column of a substance multiplied by the acceleration due to gravity = pressure exerted by the substance