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There are water droplets on the outside of the bucket – liquefaction – liquefaction of hot air when cold.
There is a mist above the pot where the water is boiled - vaporization - the liquid continues to absorb heat after it reaches the boiling point, and the phenomenon of vaporization occurs.
In winter, the water in the kitchen bucket solidifies and freezes – the solidification ......
Turn on the heat and wait for the water in the pot to dry – evaporate. >>>More
There are Chinese textbooks for the sixth grade. (New Edition).
When the water is put into the pot and heated, it becomes less, which is the change of state of matter.
Vaporization followed by liquefaction.
A. It involves the combustion of substances, C. It is the slow oxidation of iron and oxygen, and D is the slow oxidation of vegetables and oxygen, all of which are formed by other substances, which are chemical changes, and B is only a state change, and there is no other substance generation, so it is a physical change, so choose B