A scientist is sitting in her living room and hears the wind rushing past her front door. 24 points! Based on her knowledge of Bernoulli's principle, what does the scientist know even without opening the door?

1. The air outside has more mass than the air inside.

2. There is less air pressure outside the door than inside the door.

3. There is more air pressure outside the door than inside the door.

4. The air outside has less volume than the air inside.