Unlike liquids, gas viscosity with temperature. Perry’s frequently cites Sutherland's Formula for these predictions:

For wide-range calculations, Perry’s uses empirical correlation equations.

While simple fluids use standard definitions , Perry’s relies on specific models for temperature dependence: For Liquids

Thousands of organic and inorganic compounds are listed with experimental viscosity values at specific temperatures.

is in Kelvin. For many common hydrocarbons, simpler forms like are provided.