Properties of Nitric Oxide (NO)

Nitric oxide (NO) is a colorless and odorless gas molecule that plays a crucial role in various physiological processes in the human body. It acts as a signaling molecule in the cardiovascular system, helping to relax and dilate blood vessels, which can improve blood flow and lower blood pressure.

The following table provides a comprehensive list of nitric oxide properties in both SI and US customary/Imperial units at normal temperature and pressure (NTP).

Click on the icon to switch between Metric and Imperial units.

Table of Nitric Oxide Properties
Physical Properties
Metric
Molar Mass30.006 g/mol
Density (25°C)1.226 kg/m3
Dynamic Viscosity (25°C)19.2 µPa·s
Speed of Sound in Gas (10°C)330 m/s
Thermal PropertiesMetric
Melting Point-163.6 °C
Boiling Point-151.7 °C
Thermal Conductivity (25°C)0.0234 W/m·K
Specific Heat Capacity (Cp)995 J/kg·K
Critical ConstantsMetric
Critical Temperature (Tc)-93 °C
Critical Pressure (Pc)6.48 MPa
Critical Density (ρc)520 kg/m3
Electrical PropertiesMetric
Relative Permittivity (εr)1.0006
Optical PropertiesMetric
Refractive Index (589 nm)1.000297
Hazardous DataMetric
NFPA Rating (Health)3
NFPA Rating (Fire)0
NFPA Rating (Reactivity)0

Unless stated otherwise, all values are taken at room temperature (approximately 20°C or 68°F) and 1 atm pressure. (1 atm = 101,325 Pa)

References: 1) Cardarelli, François. Materials Handbook: A Concise Desktop Reference. Switzerland: Springer International Publishing, 2018. 2) CRC Handbook of Chemistry and Physics, 97th Edition. United Kingdom: CRC Press, 2016-2017. 3) Yaws, Carl L. The Yaws Handbook of Physical Properties for Hydrocarbons and Chemicals. Netherlands: Elsevier Science, 2015. 4) Fire Protection Guide to Hazardous Materials, 14th Edition. United States: National Fire Protection Association, 2010.