Dry ice refers to solid carbon dioxide. Dry ice is liquefied into a colorless liquid through professional dry ice production equipment under pressure of 6250.5498 kPa. It is then quickly solidified under low pressure. When using dry ice, dry ice does not generate new carbon dioxide. Only the original carbon dioxide is released. Therefore, dry ice is carbon-neutral and will not pollute the environment. At present, dry ice has been widely used in mold cleaning, electricity, food, pharmaceuticals, cold chain transportation, stage, etc.
How is dry ice produced?
干冰的原料是液态二氧化碳。而二氧化碳是工业生产过程中产生的副产品。工业生产中产生的二氧化碳可以通过水力净化、储存来生产干冰。特别是现代商业已经产生了一种专门制作干冰的机器，即干冰机。干冰机只需将液态二氧化碳放入机器内即可自动生产干冰。生产的干冰形状主要有粒状和块状。
Two forms of dry ice: dry ice cubes, pellets
There are two types of machines for producing dry ice, one is for dry ice cubes, and the other is for dry ice pellets. The dry ice block production machine can process liquid carbon dioxide into block-shaped dry ice. Block dry ice has a large volume, weighing about 250g~500kg, and it is not easy to melt. Therefore, block dry ice is usually used for long-term cold chain transportation.
颗粒干冰的生产范围为3~19mm，体积较小。因此，颗粒干冰一般用于餐饮、清洁、保温、舞台气氛渲染等用途。
Similarities and differences between dry ice cubes and pellets
Similarities
干冰块和颗粒均由相同的原材料液态二氧化碳制成。它们对环境无害，并且都具有冷藏的特点。
Differences
两种不同形式的干冰是由不同的机器制成的。干冰颗粒机专门用于制造颗粒状干冰。干冰块是由专用的干冰块制造机制成的。这两种形式的干冰也有不同的尺寸。而这种尺寸上的差异，使得它们的用途也略有不同。与块状干冰相比，粒状干冰具有更好的挥发性。因此，颗粒干冰也被广泛用于清洁。