# C265 – AGA 10:2003 – Velocity of Sound/Isentropic Exponent

## Description

This calculates the speed of sound, isentropic exponent and other physical properties of a natural gas composition at flowing temperature and pressure conditions.

## References

AGA Report No. 10 – Speed of Sound in Natural Gas and Other Related Hydrocarbon Gases (2003)

AGA Report No. 8 – Compressibility Factors of Natural Gas and Other Hydrocarbon Gases

Kelton calculation reference C265

FLOCALC calculation reference F092

KIMS calculation reference K140

Kelton calculation C156 – AGA 8 – Gas Density Computation

## Options

This calculation has no options. The inputs are set as the temperature and pressure at base and flowing conditions and the gas composition.

## Calculation

### Speed of Sound

The speed of sound is calculated from the formula:

### Isentropic Exponent

The isentropic exponent is calculated by: