干冰
5.If the temperature is low enough , solid carbon dioxide can exist at room pressure .
6.That piece of good news came as no surprise, because summer temperatures at the cap are high enough to vaporize frozen carbon dioxide.
7.Motive power is usually electric, CO2 or the traditional rubber strip motor.
8.New research suggests otherwise: a thick sheet of carbon dioxide ice would be too soft to stay stable.
9.Mirrors have the effect of dematerializing a wall. The dry ice seemed to dematerialize as it sublimated.
10.Content of the project: utilize CO2 resource, to set up production lines of methyl carbonate, granular dry ice powder, salicylic acid, sodium carbonate and ethylene urea etc.
