Nitrogen

Overview

Engineering reference data for Nitrogen in gases and compressed air.

Key Formulas

Ideal Gas Law

$PV = nRT$

Pressure × Volume = moles × gas constant × temperature.

Boyle's Law

$P_1 V_1 = P_2 V_2$

At constant temperature.

Charles's Law

$\frac{V_1}{T_1} = \frac{V_2}{T_2}$

At constant pressure.

Variables

Symbol	Description	Unit
$P$	Pressure	Pa
$V$	Volume	m³
$T$	Temperature	K
$R$	Gas constant	8.314 J/(mol·K)

Properties of Nitrogen

Nitrogen (N₂) constitutes about 78% of Earth's atmospheric volume. It is an inert, neutral, and colorless diatomic gas. Its specific heat capacity (cp) varies significantly with temperature, which is critical for accurate thermal calculations in heated or cooled systems.

Temperature Effects on Specific Heat

The specific heat at constant pressure for undissociated nitrogen gas increases with temperature. At very high temperatures (above ~1500 K), molecular dissociation becomes significant, and pressure starts to exert a more pronounced influence on thermodynamic properties.

Nitrogen Specific Heat Data

The following table provides the specific heat capacity (cp) for nitrogen gas (N₂) at constant pressure over a wide range of temperatures.

Interactive Charts

References

• Original Source