Which of the following statements from kinetic molecular theory can be used to explain why a region of low pressure will result in gas particles rushing into that region?

B: As particles of a gas are moving at high speed (hundreds of metres per second) and in random directions, every direction will have some particles moving in that direction. Hence a region with fewer particles (i.e. at a lower pressure) will have more particles moving into it than are moving away from it. This will tend to eliminate volumes with different pressures.