The partial pressure of He in a gas mixture refers to the pressure that would be exerted by the He gas if it were the only gas present in the same volume at the same temperature. It is a measure of the concentration of He in the mixture.
The partial pressure of He can be calculated by multiplying the total pressure of the gas mixture by the mole fraction of He in the mixture. The mole fraction is the ratio of the number of moles of He to the total number of moles in the mixture.
Partial pressure is important in gas mixtures because it helps determine the behavior of each gas component in the mixture. It also plays a role in gas diffusion, gas solubility, and gas reactions.
According to the ideal gas law, the partial pressure of He in a gas mixture is directly proportional to the temperature of the mixture. As temperature increases, the partial pressure of He also increases.
The unit of measurement for partial pressure of He is typically in units of pressure, such as atmospheres (atm) or kilopascals (kPa). However, it can also be expressed in other units such as torr or millimeters of mercury (mmHg).