敲适合小朋友学的冷知识 可爱的GIF小动物教你说英语喽
Exp敲适合小朋友学的冷知识 可爱的GIF小动物教你说英语喽
anding Your Knowledge of Cold Facts We live in a world full of fascinating and intriguing facts. Many of these facts go unnoticed and unappreciated, but they can actually be very interesting and enlightening. In this article, we will focus on some cold facts that are not only surprising, but also educational.
1. Hot water freezes faster than cold water This phenomenon is known as the Mpemba effect, named after a Tanzanian student who noticed that hot ice cream mix would freeze faster than cold mix. The reason why this happens is not entirely clear. Some scientists speculate that the hot water evaporates faster, reducing the volume of water that needs to be frozen. Others suggest that as the water cools, it releases dissolved gases, which can form nucleation sites that promote ice formation.
2. Snow is not white When we look at snow, we see a blanket of white powder covering the ground. However, snow is actually translucent, meaning that it does not absorb or reflect light like other substances. The reason why it appears white is because the light that enters the snow is scattered in all directions, creating the illusion of whiteness.
3. Ice cream was once a luxury item Today, ice cream is a staple dessert enjoyed by millions of people all over the world. However, in the past, it was a luxury item that only the wealthy could afford. In fact, ice cream was so rare and coveted that it was often served to royalty as a symbol of their wealth and status.
4. Antarctica is the driest continent on earth Most people assume that Antarctica is covered in snow and ice all year round. While it is true that Antarctica is the coldest place on earth, it is also the driest. In fact, some parts of Antarctica receive less than 10cm of precipitation per year, making it technically a desert.
5. The coldest temperature ever recorded was -144 degrees Fahrenheit On July 21, 1983, the Russian research station in Antarctica recorded a temperature of -144 degrees Fahrenheit. This is the coldest temperature ever recorded on earth, and it is almost too cold for human life to survive.
6. The snowflake is NOT the smallest ice crystal While snowflakes are often depicted as delicate, intricate designs, they are actually made up of thousands of tiny ice crystals. And, interestingly, the snowflake is not the smallest ice crystal. The ice crystal known as the "diamond dust" can be as small as 0.005 mm in diameter.
7. Lightning can occur during a blizzard Most people assume that lightning only occurs during thunderstorms. However, lightning can also occur during a blizzard, when the air is highly charged with electricity. These types of lightning strikes are known as "thundersnow." In conclusion, there are many fascinating and enlightening cold facts that people can learn about. These facts not only expand our knowledge, but also help us appreciate the world around us in new ways. So, the next time you are experiencing snow, ice, or cold weather, take a moment to reflect on these amazing facts and appreciate the beauty and wonder of the natural world.
万万没想到,数理化学得好的孩子,都在这点上下足了功夫