Name two substance which don't have fixed melting or freezing point.
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The melting point of a substance is where the solid phase changes into the liquid phase. Since air is a mixture of gases, so, all the different gases have different melting and boiling points. So, air has no boiling point and it also has no melting point.
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So, air has no boiling point and it also has no melting point. Gold is a metal, ethanol is a type of alcohol and oxygen is type of gas which have only atoms of oxygen. Hence, remaining all three have fixed substances and therefore have fixed melting/ boiling point. But air does not.
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