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Pure water freezes at 0°C and boils at 100°C (212°F) under normal pressure conditions. When salt is added, the freezing point is lowered and the boiling point is raised. The addition of salt also lowers the temperature of maximum density below that of pure water (4°C [39.2°F]). The temperature of maximum density decreases faster than the freezing point as salt is added.
Source: Encyclopaedia Britannica