Freezing and cryogenic are two different concepts that differ in definition, application, and effectiveness.
First of all
from the definition of freezing, freezing refers to a process of changing the state of matter by using low temperature conditions to make matter lose its original motion in space or time. In physics, freezing refers to the process of reducing the degree of thermal motion of a substance by lowering its temperature, so that it can change from a solid state to a liquid state or from a liquid state to a solid state. Cryogenics, on the other hand, is a concept of a temperature range, which is usually defined as a temperature range of less than zero degrees (0°C). The criteria for determining low temperatures may vary in different fields. In the food industry, for example, temperatures below -18°C are often classified as low temperatures.
Secondly
from the perspective of application, freezing is a complex process involving the change of material state, which is widely used in many fields. In the food industry, freezing is used to preserve food, such as fish, etc., by lowering the temperature to freeze the liquid moisture in the food into a solid state, thereby inhibiting the reproduction of microorganisms, preventing organism from spoiling, and facilitating storage and handling. In biology, freezing is used to preserve and prolong the life activities of living organisms. In addition, in the chemical industry, freezing technology is also widely used to separate and purify substances. Whereas, cryogenic is more often used to describe the temperature state of an object or environment, such as a cryogenic environment in a laboratory, cryogenic treatment in medicine, etc.
Finally
in terms of effect, freezing not only changes the temperature of the substance, but more importantly, changes the state and nature of the substance. For example, in the freeze-drying process, water evaporates quickly at low temperatures and is pumped away, leaving the substance dry and able to retain its original state for a long time. Whereas, cryogenic is mainly concerned with lowering the temperature of an object in order to achieve a specific effect or purpose.
In summary, although both freezing and cryogenic involve changes in temperature, they have distinct differences in definition, application, and effect. Freezing is a complex process that involves changes in the state of matter, while cryogenic is more concerned with the temperature state of an object or environment.
