Liquid Nitrogen Safety

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http://webs.wichita.edu/facsme/nitro/safe.htm

Liquid Nitrogen Safety
Liquid Nitrogen Demonstrations Safety Notes & Concerns Liquid nitrogen is a dangerous material. The following is an excerpt from the Air Products Nitrogen Material Safety Data Sheet: A back of the envelope calculation indicates that the entire contents of a 10 Liter dewar being spilled in a unventilated 274 square foot room with an 8 foot ceiling would reduce oxygen levels below the 19.5% level ...