Assertion list for term "become less dense".

Results from Ascent++: 5
breast CapableOfbecome less dense 0.37
universe CapableOfbecome less dense 0.35
atmosphere (aspect of sun) CapableOfbecome less dense 0.35
fluid CapableOfbecome less dense 0.33
water (aspect of lake) CapableOfbecome less dense 0.32