小学实用知识大全 英语
Unu冷知识 这么多年中英文单词白学了
sual Cold Facts You Never Knew Cold temperatures are not only inconvenient, but they can also be dangerous if not properly dealt with. However, there are some fascinating and useful facts that you may not know about this frigid weather. Here are some unusual cold facts that can help you better appreciate the winter season and keep you safe.
1. Snow Can Absorb Sound Have you ever noticed how much quieter it seems when it is snowing? That is because snow can absorb sound waves, making the environment significantly quieter than it would be on a normal day. On a snowy day, you can hear whispers from afar and noises that would not normally be audible.
2. Ice Is Slippery Due to Pressure When you step on ice, you may feel like you are stepping on a surface coated with a thin layer of oil. This slippery surface is caused by pressure. Although ice is solid, when you apply pressure to it, the molecules start to shift and slide. When pressure from your body weight is combined with the thin layer of water on the surface of the ice, it creates a smooth and slippery surface.
3. Cold Temperatures Can Be Beneficial to Sleep The ideal sleep temperature is between 60 to 67 degrees Fahrenheit. This is because your body temperature naturally lowers at night to promote sleep. When the environment is too warm, your body has a harder time regulating its temperature, which can lead to disrupted sleep. Sleeping in cold temperatures can help promote deeper and more restful sleep.
4. Winter Air Is Drier During the winter season, the air is drier than during any other time of the year. This is because the colder air cannot hold as much moisture as warmer air. As a result, you may experience dry skin, chapped lips, and even nosebleeds. It is important to keep yourself hydrated during this time and to use a humidifier to add moisture to the air.
5. Frostbite Can Occur in Minutes Frostbite is a serious condition that occurs when your body tissue freezes. It is most common in your fingers, toes, nose, and ears. The risk of frostbite increases when the temperature falls below 5 degrees Fahrenheit, and wind chill drops below -15 degrees Fahrenheit. Frostbite can occur in just a few minutes in these conditions if skin is left exposed.
6. Snowflakes Can Be Different Shapes Contrary to popular belief, not all snowflakes are the same shape. Snowflakes can take on various forms and shapes depending on the temperature, humidity, and other factors. While some can be perfectly symmetrical, others can be lopsided or have a unique shape. This is due to the way the water molecules form and bond together to create the snowflake.
7. Cold Air Can Affect Your Car's Battery Cold air can have a major effect on your car's battery. At temperatures below freezing, a battery can lose up to 50% of its starting power. This is because the chemical reaction that occurs in a battery to generate electricity slows down in colder temperatures. To keep your battery strong during the winter season, it is important to have it checked regularly and to keep your car in a garage or covered area. Overall, there are many fascinating cold facts that can help you better understand and appreciate the winter season. By using this knowledge, you can also stay safe and avoid common dangers associated with extreme cold temperatures.
关于英语 你不知道的英语冷知识