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Vapor density:  1.42 (air = 1)
Saturated concentrations in air: 163 g/m3 at 20 deg C, and 249 g/m3 at 30 deg C
Emits highly toxic fumes of hydrogen cyanide when heated to decomposition or reacted with acids or oxidizing agents

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Merck (1989) published a vapor density value of 1.42 (air = 1) for acetonitrile vapor. Verschueren (1983) published saturated concentrations of 163 g/m3 at 20 deg C, and 249 g/m3 at 30 deg C, for acetonitrile in air. Reynolds (1982) published that acetonitrile emits highly toxic fumes of hydrogen cyanide when heated to decomposition or reacted with acids or oxidizing agents.