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every substance has a melting point and a boiling point. the former is the temperature which it changes solid liquid. the latter is the temperature it changes liquid gas. these changes are called changes . sometimes the properties a substance change when it changes its state. example, if the temperature oxygen falls below -183 c, it changes a colourless gas a bluish liquid, which is highly magnetic.
Every substance has a melting point and a boiling point. The former is the temperature at which it changes from solid to liquid. The latter is the temperature at which it changes from liquid to gas. These changes are called changes of state. Sometimes the properties of a substance change when it changes its state. For example, if the temperature of oxygen falls below -183 C, it changes from a colourless gas to a bluish liquid, which is highly magnetic.