Standard density is calculated as follows:

Symbol | Description | Units |
---|---|---|

ρ_{std} |
Density at standard conditions | kg/Sm^{3} |

SG | Specific gravity | - |

p_{std} |
Standard pressure | bar a |

t_{std} |
Standard temperature | K |

z_{std} |
Compression factor at standard conditions | - |

Constant | Description | Value | Units |
---|---|---|---|

R | Universal Gas Constant | 8.31451 | J/mol/K |

M_{air} |
Molar mass of dry air | 28.9626 | kg/kmol |