Question

The density of gas particles in a section of Earth’s atmosphere decreases. Which of the following is the most likely explanation for this event?

The air pressure in that section of Earth’s atmosphere decreased.

The air pressure in that section of Earth’s atmosphere increased.

The total number of gas particles in Earth’s atmosphere decreased.

The total number of gas particles in Earth’s atmosphere increased.

Answer 1

If the density decreases, then the particles are spreading out. That could be because they aren't being pressed together as hard.

Answer 2

so B?

Answer 3

Not as much = decrease

Answer 4

If the pressure increased, then the particles would be squeezed together tighter and the density would go up.