During vaporization are particles increasing or decreasing in speed?

increasing. vaporization transition of liquid gas. particles move more concrete forms (solids) less concrete forms (liquids, gases), increase speed.

way visualize remember particles move. in solid, molecules 'hum' vibrate. when increase energy in particles, vibrate more , more until break loose solid bonds , form fluid. similarly, when apply increasing energy fluid, particles vibrate more , more until can escape fluid bonds , form gas.

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