Which notation represents the partial pressure of nitrogen?

The notation that represents the partial pressure of nitrogen is PN2. In the context of gas laws and respiration, each gas in a mixture of gases, such as air, exerts its own partial pressure. The partial pressure of a specific gas is determined by its concentration in the mixture and the total pressure of the gas mixture.

In the standard notation used for gases, the letter "P" is commonly used to denote pressure, while the subscript indicates the specific gas in question. Therefore, PN2 specifically indicates the partial pressure of nitrogen. This is crucial in aerospace physiology as understanding the different partial pressures of gases such as nitrogen and oxygen is essential for assessing issues related to altitude and hypoxia.

In contrast to this, PO2 would refer to the partial pressure of oxygen, PCO2 pertains to carbon dioxide, and PGas represents the partial pressure of a generic gas without specificity. Hence, only PN2 accurately describes the partial pressure of nitrogen in the context of respiratory physiology and gas exchange.