A few weeks ago, a technician from a regional opera company called the ESTA office with a list of questions about liquid nitrogen fog technology. Did the nitrogen vented from the storage dewar tend to pool, as butane will when released from an LP gas canister? (No, and it won't burn, either.) Would it be okay to store the liquid nitrogen dewars in an understage trap room? (Yes, if there is good ventilation.) Is the gas toxic? (No.) His questions went on and on, and he listened to the ...

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