What is a pneumatic structure?

Question

A pneumatic structure is:

1. Membrane structures
2. Stabilized by compressed air
3. Characterized by internal pressure being less than external pressure
4. Characterized by internal pressure being equal to or more than external pressure

Select the correct answer using the codes given below:

1. 1,2 and 3
2. 1,2 and 4
3. 2 and 4 only
4. 1 and 4 only

Answer 1

The answer is C. Pneumatic structures utilize compressed air