boiling
change
chemical
chemistry
condensation
crystal
density
education
educational
elementary
evaporation
experiment
freeze
freezing
fundamental
gas
glass
heat
ice
illustration
learning
liquid
matter
measurement
melt
melting
molecular
molecule
phase
physical
physics
point
science
scientific
solid
state
state matter
states
steam
structure
substance remains
temperature
vapour
warm
warming
water
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