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Helium has the lowest boiling and freezing points of all elements. It boils at -268.9°C and freezes at -272.2°C.
Urea, with a melting point of 133-135 0C.
Alcohol has a lower freezing point than water, so when it is added to a cold drink, it can lower the overall temperature of the liquid, causing it to freeze more easily. The freezing point of the mixture becomes lower than the freezing point of water alone, resulting in the straw freezing.
Salty ocean water has the lowest freezing point among the three options due to the presence of dissolved salts like sodium chloride. The salt lowers the freezing point of water, making it freeze at a lower temperature compared to fresh water.