Viscosity of Nitric Acid


Nitric acid is a highly corrosive strong mineral acid with the molecular formula HNO3. It is also known as aqua fortis and spirit of niter. The pure compound is colorless, but older samples tend to acquire a yellow cast due to decomposition into oxides of nitrogen and water.

Most commercially available nitric acid has a concentration of 68%. When the solution contains more than 86% it is referred to as fuming nitric acid.

Nitric acid is the primary reagent used for nitration - the addition of a nitro group typically to an organic molecule. While some resulting nitro compounds are shock- and thermally sensitive explosives, a few are stable enough to be used in munitions and demolition. Others are still more stable and used as pigments in inks and dyes. Nitric acid is commonly used as a strong oxidizing agent.

Viscosity Tables – Measurement data

Nitric acid 60%

Temp. [°C] Dyn. Viscosity [mPa.s]
0 3.500
20 2.500
50 1.400
100 0.700

Nitric acid 60% - dynamic viscosity over temperature


Nitric acid 95%

Temp. [°C] Dyn. Viscosity [mPa.s]
0 1.500
20 1.200
50 0.850
100 0.500




Reference RoyMech
Kin. vis. no
Dyn. vis. yes
Density no
Multiple temperatures yes
Related Nitric acid, mineral acid, aqua fortis, spirit of niter, acid, fuming nitric acid, pigment in inks and dyes, oxidizing agent