Category:Nitrogen used for cooling

This category is for images that are connected with cooling with nitrogen. Food, biological tissue, and items undergoing heat stress cycling are often cooled using gases. Sometimes the gas is employed in liquid form, The most popular being liquid nitrogen. Sometime the gas CO₂ is in the solid form of dry ice. Sometime the sudden expansion of compressed gas is used for cooling. Examples: Food stuffs, Biological materials. Engineering and science applications.