Allergy Headache Management and Treatment. 1  For all headaches, identify triggers and avoid them. 2  For relief of sinus headaches, make changes to your home and to your behavior. 3  Control some headaches with nonprescription (over-the-counter) medications.  See an allergist for prescription medications, which may be more effective.
At temperatures below 32 Â° F (0 Â° C), liquid water freezes; 32 Â° F (0 Â° C) is the freezing point of water. At temperatures above 32 Â° F (0 Â° C), pure water ice melts and changes state from a solid to a liquid (water); 32 Â° F (0 Â° C) is the melting point.
The melting point of ice is 0 Â°C (32 Â°F; 273 K) at standard pressure; however, pure liquid water can be supercooled well below that temperature without freezing if the liquid is not mechanically disturbed. It can remain in a fluid state down to its homogeneous nucleation point of about 231 K (â42 Â°C; â44 Â°F).