Although air is a mixture of gases, it is generally treated as an individual gas with accounting made only for other components such as moisture when present.

When a mixture is saturated, the proper terminology is that the volume occupied by the mixture is saturated by one or more of the components. For air space, which is partially saturated by water vapor, the actual partial pressure of the water vapor may be determined by multiplying the saturation pressure at the space temperature by the relative humidity.

Relative humidity can be calculated from the following:

x 100


Specific humidity, which is the weight of water vapor to the weight of dry air, is given by the following ratio:

Psychrometric charts plot wet bulb and dry bulb data for air-water vapor mixtures at atmospheric pressure. These charts are quite useful for moisture corrections in air compressors with atmospheric inlets (see Figures B-2 and B-3 in Appendix B).

Renewable Energy 101

Renewable Energy 101

Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.

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