Describe the conditions necessary for sublimation to occur.

Sample Response: Sublimation occurs because the atoms in a solid must gain enough energy to form a gas without passing through the liquid state.  Low air pressure and large amounts of energy, often in the form of heat, allow the atoms to move fast enough to overcome the attractive forces between them.

current and voltage can both be different in different parts of a circuit so it matters where you place the ammeter and voltmete