内容正文:
专题 10
热的食物放进冰箱会有什么变化
(人与自然)
主题语境
What Happens When You Put Hot Food In The Fridge?
话题
人与自然
文章来源
www.scienceabc.com
饮食与健康
饮食与科学
目录:
1. 外刊时文
2. 热词+短语
3. 高考链接--词汇运用
4. 长难句解析
5. 全文翻译
6. 高考链接--语法填空
一 外刊原文
What Happens When You Put Hot Food In The Fridge?
In the manual for many refrigerators, it says not to put hot food inside because it can affect the functioning of the fridge in the long run. Storing hot food results in extra pressure being put on refrigerator machinery, so it should be avoided.
However, there are other reasons apart from fridge health, specifically the health of the food inside the fridge. Keeping hot food inside raises the temperature inside, which makes everything inside hotter. The fridge compressor must therefore work harder to keep the temperature inside at the level you want.
We've all learned about the second law of thermodynamics, which says that heat moves from places of a higher temperature to places with a lower temperature. This is what convection(传送,对流) does.
Convection is a mode of heat transfer that occurs in states that are free to move, like liquid and gas. When a hot liquid or gas warms up, it gets lighter and rises, while cooler air comes in to replace it below.
Second, when we put hot things in the fridge, the temperature difference between the two systems causes condensation. The droplets may end up on the back wall of the fridge, where they can freeze food that touches them. Also, condensation(冷凝) adds moisture to the fridge environment, which is not advisable for food preservation.
As a result of the combined process of convection and condensation after we put hot food inside, the interior environment of the refrigerator becomes unfavorable for preservation and reduces the optimum functioning due to increased internal temperature and humidity(湿度) inside the fridge.
One way to keep the fridge from getting too hot in an emergency situation like this is to divide the food into smaller portions. Leave som