How To Make Dry Ice

Did you remember those times when you have nothing but ice boxes to chill your food items? Icebox is the refrigerator’s precursor, with all the large ice blocks that melts over time. It is quite a mess when they turn into liquid.

The problem can be prevented by using dry ice instead. Just as the name indicates, dry ice doesn’t undergo that messy melting process but it turns into gas instead of liquid. Dry ice changes its form when introduced at high pressure and is made from pure carbon dioxide.

Carbon dioxide when exposed to high pressure undergoes a solid-liquid-gas transformation in similar way as nature of water exposed to low pressure changes with sea level and boil at low temperatures. Carbon dioxide is not liquid nor gas when it is at normal pressure. But then, it turns into liquid when placed it inside the fire extinguisher’s chamber with high pressure.

It requires a source of carbon dioxide to create dry ice which usually comes from industrial procedures like those found in ethanol plants. As we all know, carbon dioxide is a gas and it can be converted to liquid form by putting it under pressure. To maintain its liquid form, it must be stored under pressure in a tank. When the liquid form of carbon dioxide is brought out in normal air temperature, some parts of it become frozen and can be later on processed to become dry ice blocks while some goes out as a colorless carbon dioxide gas.

Dry ice is ideal to use in maintaining the freshness of perishable items for transport purposes especially over long distances. There will be no mess since it doesn’t melt; rather it turns back to its original air form. Since carbon dioxide mixes with air as it evaporates, it should not be stored in a closed area or vehicle. Carbon dioxide in excessive amount is toxic and it can endanger your life.


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