Maple can perform calculations and generate visualizations involving thermophysical properties of pure fluids, humid air, and mixtures. Using the dew-point and web-bulb temperature of air as an example, this Tips and Techniques application demonstrates how to access thermophysical properties data, perform calculations that include units, and visualize the results on a psychrometric chart.

Atmospheric air contains varying levels of water vapor. Weather reports often quantify the water content of air with its relative humidity; this is the amount of water in air, divided by the maximum amount of water air can hold at the same temperature.

Given the temperature and the relative humidity of air, you can calculate:

• the temperature below which water condenses out of air - this is known as the dew-point
• the coldest temperature you can achieve through evaporative cooling - this is known as the wet-bulb temperature