Heat kills by pushing the human body beyond its limits. In extreme heat and high humidity (which is when the air has moisture and feels sticky) the body must work extra hard to maintain a normal temperature and keep the body comfortable. A heat wave is an extended period of extreme heat, and there is often high humidity. These conditions can be dangerous for people who don't take care of themselves properly.
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Sickness can occur if someone has been in extreme heat for too long, or has over-exercised for his or her age or physical condition. Extreme heat can be more dangerous for older people, the very young, and people who are sick or overweight. People who live in cities can be at greater risk because concrete and asphalt store heat for longer and release it throughout the night, so nights don’t get as cool as in areas with less concrete.
The amount of water vapor in the air. Humidity is invisible and can make sweating less effective.
The measure of how hot or cold something is
When the body temperature gets too high and can make someone breathe fast, feel dizzy, throw up, get headaches, or feel weak. This can be deadly.
A dangerous condition where the body absorbs more heat than it can get rid of