density
mass per unit volume, M / V
why are solids more dense than gases and liquids?
particles are closely arranged
volume
3D space occupied by a substance
how can you find the volume of an irregular object?
measure water displaced
Gas to solid
deposition
Solid to gas
sublimation
conservation of mass
mass of substance is the same before and after state change
kinetic energy theory
all matter is of invisible particles that act differently, giving rise to different states of matter