# NIOSH Pocket Guide to Chemical Hazards
Nitrous oxide | CAS 10024-97-2
N2O | RTECS QX1350000
Synonyms & Trade Names Dinitrogen monoxide, Hyponitrous acid anhydride, Laughing gas | DOT ID & Guide 1070 122 2201 122 (refrigerated liquid)
Exposure Limits | NIOSH REL*: TWA 25 ppm (46 mg/m3) (TWA over the time exposed) [*Note: REL for exposure to waste anesthetic gas.]
OSHA PEL: none
IDLH N.D. | Conversion 1 ppm = 1.80 mg/m3
Physical Description Colorless gas with a slightly sweet odor. [inhalation anesthetic] [Note: Shipped as a liquefied compressed gas.]
MW: 44.0 | BP: -127°F | FRZ: -132°F | Sol(77°F): 0.1%
VP: 51.3 atm | IP: 12.89 eV | RGasD: 1.53 |
Fl.P: NA | UEL: NA | LEL: NA |
Nonflammable Gas, but supports combustion at elevated temperatures.
Incompatibilities & Reactivities Aluminum, boron, hydrazine, lithium hydride, phosphine, sodium
Measurement Methods NIOSH 3800, 6600; OSHA ID166
Personal Protection & Sanitation Skin: Frostbite Eyes: Frostbite Wash skin: No recommendation Remove: No recommendation Change: No recommendation Provide: Frostbite | First Aid (See procedures) Eye: Frostbite Skin: Frostbite Breathing: Fresh air
Respirator Recommendations To be added later
Exposure Routes inhalation, skin and/or eye contact (liquid)
Symptoms Dyspnea (breathing difficulty); drowsiness, headache; asphyxia; reproductive effects; liquid: frostbite
Target Organs respiratory system, central nervous system, reproductive system
See also: INTRODUCTION