Use the following graph to find density altitude either on the ground or aloft. Set your altimeter at 29.92 inches; it now indicates pressure altitude. Read outside air temperature. Enter the graph at your pressure altitude and move horizontally to the temperature. Read density altitude from the sloping lines.

EXAMPLE 1. Find density altitude in flight. Pressure altitude is 9,500 feet; and temperature, 18 degrees F. Find 9,500 feet on the left of the graph and move across to 18 degrees F. Density altitude is 9,000 feet (marked "1" on the Graph).

EXAMPLE 2. Find density altitude for take-off. Pressure altitude is 4,950 feet; and temperature, 97 degrees F. Enter the graph at 4,950 feet and move across to 97 degrees F. Density altitude is 8,200 feet (marked "2" on graph). Note that in the warm air, density altitude is considerably higher than pressure altitude.