Lupus is an autoimmune disease. This means that your immune system attacks healthy cells and tissues by mistake. This can damage many parts of the body, including the joints, skin, kidneys, heart, lungs, blood vessels, and brain. There are several kinds of lupus.
Freezing, or solidification, is a phase transition in which a liquid turns into a solid when its temperature is lowered below its freezing point. For most substances, the melting and freezing points are the same temperature; however, certain substances possess differing solidâliquid transition temperatures.
At altitude, where the air pressure is lower than at sea level, the freezing point of water increases slightly. Salt lowers the freezing point of water so that it won't freeze until the temperature drops below 0 degrees Celsius. The exact temperature needed depends on how much salt is in the water.