What Is a Heat Wave?
A heat wave is a period of unusually hot weather that lasts for several days or more. It is often accompanied by high humidity, making it feel even hotter. Heat waves can occur in many parts of the world, and they are becoming more frequent and severe due to climate change.
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Causes, Features, and Criteria of Heat Waves
Heat waves are caused by high-pressure systems that trap hot air in a region. These systems block clouds and wind, allowing temperatures to rise quickly. Each country may have its own criteria for defining a heat wave. For example, in South Korea, a heat wave is declared when the daily high temperature is 33¡ÆC or higher for two or more consecutive days.
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How Heat Waves Affect Health
Heat waves can be very dangerous, especially for the elderly, children, and people with chronic diseases. Exposure to extreme heat can cause heat exhaustion, dehydration, and even heatstroke, which is a life-threatening condition. In addition, hot weather can worsen existing medical conditions, such as heart and respiratory diseases.
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How the Human Body Responds to Extreme Heat
When exposed to high temperatures, the human body tries to stay cool by sweating. However, if the body loses too much water and salt, it becomes hard to regulate temperature. As a result, people may experience dizziness, nausea, rapid heartbeat, and confusion. If the body fails to cool down, it may lead to heatstroke, which requires immediate medical attention.
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Personal Health Tips to Stay Safe During Heat Waves
To protect yourself during a heat wave, drink plenty of water even if you¡¯re not thirsty. Avoid outdoor activities during the hottest parts of the day, usually from 12 p.m. to 5 p.m. Stay in cool places, wear light clothing, and use fans or air conditioners if possible. Check on family members, especially the elderly or those living alone.
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Useful English Vocabulary
heat wave Æø¿°
humidity ½Àµµ
high-pressure system °í±â¾Ð ½Ã½ºÅÛ
dehydration Å»¼ö
heatstroke ¿»çº´
regulate Á¶ÀýÇÏ´Ù
dizziness ¾îÁö·³Áõ
confusion È¥¶õ
light clothing °¡º¿î ¿ÊÂ÷¸²
chronic disease ¸¸¼º Áúȯ