| http://www.w3.org/ns/prov#value | - A heat wave is a prolonged period of excess heat, combined with excessive humidity The heat index is a calculation in degrees Fahrenheit to tell how hot it feels when relative humidity is added to air temperature Heat cramps occur when muscles ache and spasm due to heavy exertion and may be the first sigh the body is in heat distress Heat exhaustion occurs when people exert themselves in hot, humi
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