Substances can exist in three states of matter - solid, liquid and gas. Substances can change states. To change the state of a substance energy must be transferred to, or from, the substance.

Does it feel like a solid, liquid, or gas? Leave the shaving cream blob out overnight. Look at it very closely the next day. How has it changed? Leave it for a few more days. Has its state changed?

Lithium-ion batteries have been a staple in device manufacturing for years, but the liquid electrolytes they rely on to ...