Dry Ice
Dry Ice is frozen
carbon dioxide, a normal part of our earth's atmosphere. It is
the gas that we exhale during breathing and the gas that plants
use in photosynthesis. It is also the same gas commonly added to
water to make soda water. Dry Ice is particularly useful for
freezing, and keeping things frozen because of its very cold
temperature: -109.3°F or -78.5°C. Dry Ice is widely used because
it is simple to freeze and easy to handle using insulated
gloves. Dry Ice changes directly from a solid to a gas
-sublimation- in normal atmospheric conditions without going
through a wet liquid stage. Therefore it gets the name "dry
ice."
As a general
rule, Dry Ice will sublimate at a rate of five to ten pounds
every 24 hours in a typical ice chest. This sublimation
continues from the time of purchase, therefore, pick up Dry Ice
as close to the time needed as possible. Bring an ice chest or
some other insulated container to hold the Dry Ice and slow the
sublimation rate. Dry Ice sublimates faster than regular ice
melts but will extend the life of regular ice. |