What are cryogens and why are they hazardous?
Cryogens are liquefied gases that can condense oxygen from the air to create an oxygen rich atmosphere in the nitrogen solution; increasing the potential for fire if flammable or combustible materials are present. Asphyxiation and container over-pressurization are significant hazards due to the large expansion ratio from liquid to gas (700 to 1). Many materials become brittle at extremely low temperatures. Brief contact with materials at extremely low temperatures can cause burns similar to thermal burns. Some of the hazards associated with cryogens are fire, pressure, weakening of materials, and skin or eye burns upon contact with the liquid.
What is a dewar?
A dewar is an insulated container used to store and transport liquefied gases. It is insulated by a vacuum between its two walls and is equipped with pressure relief device
How should I handle cryogenic materials?
What do I do if I spill a cryogen?