Laboratory Liquid Nitrogen Sample Storage is a method used to preserve biological and chemical samples at extremely low temperatures. By immersing samples in liquid nitrogen, which is -196°C (-321°F), this technique halts biological activity and chemical reactions, thereby maintaining sample integrity over long periods. This preservation method is crucial for research and medical applications where sample degradation could lead to inaccurate results. It’s commonly used for storing cell cultures, DNA, and other sensitive materials. The ultra-cold environment of liquid nitrogen ensures that samples remain viable and unchanged until they are needed for analysis or experimentation.