For example, if water is heated in a pan or in a kettle, it boils and turns into steam. The temperature this happens at is called the boiling point. The boiling point of water is 100°C.

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For example, mercury is a liquid at room temperature. The metals in Group 1, such as lithium, sodium and potassium, are all soft. Many non-metals have low melting and boiling points. When non ...