A cylinder at left with balls evenly spaced throughout the cylinder has an arrow leading to a cylinder at right cylinder with balls in a layer at its bottom.

Question

Which change of state is shown in the model?

condensation
boiling
sublimation
freezing

Answer 1

The model you described seems to represent a change from a gas to a liquid. If the balls are evenly spaced throughout the left cylinder (which can represent gas particles) and then concentrated at the bottom of the right cylinder (which could represent liquid), this scenario depicts condensation.

Therefore, the change of state shown in the model is condensation.