A freezer is a refrigeration equipment comprising a thermally insulated compartment, which helps it to keep cold and thus avoid damage or degradation. It is kept cold by compression or by absorption, which is able to keep the products stored inside at a temperature below 0 °C, usually between -30 °C and -4 °C. Although some equipment can currently reach temperatures of -80 °C.
Its function is to maintain, in a controlled environment, various fluids and substances, so that they are preserved in good conditions, since the lower the temperature, the less chemical and biological activity. To achieve this requires that the interior temperature of the refrigerator is lower than the ambient temperature.