国产热热热精品,亚洲视频久久】日韩,三级婷婷在线久久,99人妻精品视频,精品九热人人肉肉在线,AV东京热一区二区,91po在线视频观看,久久激情宗合,青青草黄色手机视频

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

 
 
 




望谟县| 天门市| 灯塔市| 吉林市| 长治县| 留坝县| 安乡县| 七台河市| 高邑县| 资阳市| 兴化市| 吐鲁番市| 雷波县| 卢湾区| 岐山县| 浦江县| 巴中市| 康保县| 寻乌县| 腾冲县| 邢台市| 洪湖市| 定西市| 东港市| 应城市| 大方县| 迁西县| 永定县| 璧山县| 西和县| 镶黄旗| 颍上县| 石首市| 兴业县| 咸阳市| 油尖旺区| 望江县| 陆河县| 江口县| 镇安县| 锡林浩特市|