综合一区欧美国产,99国产麻豆免费精品,九九精品黄色录像,亚洲激情青青草,久久亚洲熟妇熟,中文字幕av在线播放,国产一区二区卡,九九久久国产精品,久久精品视频免费

您現(xiàn)在的位置: > Language Tips > Easy English > Odd Question  
 





  What is dry ice?
[ 2006-04-11 08:52 ]

"Dry Ice," the trademark name for solid carbon dioxide, reaches its solid state when cooled liquid carbon dioxide is put under pressure.

Scientists successfully produced the snowy, white solid, which produced temperatures dipping as low as 109 degrees Fahrenheit, and envisioned dozens of practical uses for "Dry Ice." Unfortunately, they had yet to discover how to keep this solid from melting back into its original liquid state.

Fortunately, the solution to the scientists' dilemma, which possibly dawned on them over cocktails at happy hour, lay in the fact that when "Dry Ice" mixes with liquids having very low freezing temperatures, for example alcohol, instead of melting, the solid turns into gas. Because the gas escapes into the air, it packs more refrigeration power than an identical amount of ice made from water.

The primary use for "Dry Ice," both then and today, is to keep perishables fresh, especially during shipment. Solid carbon dioxide made its debut as the packing material of choice for ice cream.

Today, products such as fish and meat can be shipped thousands of miles, and arrive at their destinations. Eggs can remain fresh indefinitely if refrigerated with solid carbon dioxide, as the primary reason they grow stale is the escape of carbon dioxide from tiny pores in their shells. When enveloped by the vapor from the gas solid carbon dioxide emits, the escape of carbon dioxide from their shells is cancelled out.

Even florists take advantage of the preservative property of "Dry Ice," and can prevent flower buds from opening for up to three days by placing them in a solid carbon dioxide atmosphere. Essentially, "Dry Ice" temporarily freezes the aging process to suit our purposes.

 

note:

solid carbon dioxide: 固體二氧化碳

 

 

 

 

 

 

 

perishable: 容易腐爛的東西

 

 

 

cancel out: 抵償

 
 
 




耒阳市| 同德县| 桐庐县| 孟津县| 城步| 敖汉旗| 禹州市| 商都县| 宜兰市| 墨竹工卡县| 普兰店市| 塔城市| 湛江市| 隆尧县| 吐鲁番市| 保定市| 敖汉旗| 湖州市| 呼和浩特市| 通化县| 含山县| 黔江区| 普兰县| 玛沁县| 西林县| 奉新县| 建德市| 连南| 肥东县| 民勤县| 荔浦县| 溧阳市| 乐昌市| 镇雄县| 宁波市| 绥中县| 井陉县| 景洪市| 苏州市| 彭山县| 山西省|