Molecular formula :
nature : a state of the three substances -- gaseous, liquid and solid in a certain temperature, pressure can be transformed into each other. Under certain conditions, material from one phase into another phase of the process is known as phase change. A familiar example is the atmospheric pressure, water boiling at 100 ° C into water vapor, 0 ° C into solid ice; Conversely, higher than the 0 ° C water ice also Melting Formation below 100 ° Ccemented cold water. Melting solid, liquid gasification, gas liquefaction and other liquid solidification of state changes, collectively known as phase change.
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