# What is the kinematic viscosity of air?

## What is the kinematic viscosity of air?

The kinematic viscosity of air at 15 °C is 1.48 × 10-5 m2 /s or 14.8 cSt.

**How do you find the kinematic viscosity of air?**

1 Kinematic Viscosity (ν) The kinematic viscosity is an atmospheric variable defined as the ratio between the dynamic viscosity μ and the density ρ of the fluid, i.e. and depends on both air temperature and pressure. For air at sea level pressure and 20 °C, ρ = 1.205 × 10−3 g cm−3 and ν = 0.15 cm2 s−1.

**What is the kinematic viscosity of air at 20 degrees Celsius?**

Kinematic viscosity of air at 20°C is given to be 1.6 × 10-5 m2/s.

### What is the K of air?

1.4

In most of the cases, K is referred to as the ratio of specific heats. Here, the value of K for air is 1.4.

**What is absolute viscosity of air?**

Water at 20.2oC (68.4oF) has the absolute viscosity of one – 1 – centiPoise….Dynamic (absolute) Viscosity.

Liquid | Absolute Viscosity *) (N s/m2, Pa s) |
---|---|

Air | 1.983 10-5 |

Water | 10-3 |

Olive Oil | 10-1 |

Glycerol | 100 |

**Does viscosity of air change with pressure?**

At high pressures the viscosity increases with increasing pressure.

#### How does the viscosity of air vary with temperature?

The increase in temperature causes the kinetic or thermal energy to increase and the molecules become more mobile. The attractive binding energy is reduced and therefore the viscosity is reduced.

**What is the R constant for air?**

= 287 J/kg·K

The value of R depends on the units involved, but is usually stated with S.I. units as: R = 8.314 J/mol·K. This means that for air, you can use the value R = 287 J/kg·K.

**What is Gamma for air?**

gamma = 1.4

“Gamma” is just a number whose value depends on the state of the gas. For air, gamma = 1.4 for standard day conditions. “Gamma” appears in several equations which relate pressure, temperature, and volume during a simple compression or expansion process.

## Why does air viscosity increase with temperature?

From the basis of the kinetic theory of gases, viscosity in gases increases with temperature because the increase in kinetic energy will increase the frequency of collisions between the molecules.

**How does kinematic viscosity vary with pressure?**

Therefore an increase in the pressure will decrease the kinematic viscosity, vice-versa. Kinematic viscosity will decrease on an increase in temperature for liquids and kinematic viscosity will increase on a decrease in temperature.

**What is the relationship between pressure and viscosity?**

Viscosity is normally independent of pressure, but liquids under extreme pressure often experience an increase in viscosity. Since liquids are normally incompressible, an increase in pressure doesn’t really bring the molecules significantly closer together.