swViscosity {oce} | R Documentation

## Seawater viscosity

### Description

Compute viscosity of seawater, in Pa*s

### Usage

    swViscosity(salinity, temperature=NULL)

### Arguments

`salinity` | either salinity [PSU] (in which case `temperature` and `pressure` must be provided) or a `ctd` object (in which case `salinity`, `temperature` and `pressure` are determined from the object, and must not be provided in the argument list).
`temperature` | in-situ temperature [degC], defined on the ITS-90 scale; see “Temperature units” in the documentation for `swRho`, and the examples below.

### Details

If the first argument is a `ctd` object, then salinity, temperature and pressure values are extracted from it, and used for the calculation.

The result is determined from a regression of the data provided in Table 87 of Dorsey (1940). The fit matches the table to within 0.2 percent at worst, and with average absolute error of 0.07 percent. The maximum deviation from the table is one unit in the last decimal place.

No pressure dependence was reported by Dorsey (1940).

### Value

Viscosity of seawater in Pa*s. Divide by density to get kinematic viscosity in m^2/s.

### Author(s)

Dan Kelley

### References

N. Ernest Dorsey (1940), Properties of ordinary Water-substance, American Chemical Society Monograph Series. Reinhold Publishing.

### Examples

    swViscosity(30, 10) # 0.001383779

[Package oce version 0.9-18 Index]