Map climatic features as the long-term mean values (of atmospheric pressure, temperature, humidity, total precipitation, and so forth) to connect points with equal values of the feature in question—for example, isobars for pressure, isotherms for temperature, and isohyets for precipitation. Isoamplitudes are drawn on maps of amplitudes (for example, annual amplitudes of air temperature—that is, the differences between the mean temperatures of the warmest and coldest month). Isanomals are drawn on maps of anomalies (for example, deviations of the mean temperature of each place from the mean temperature of the entire latitudinal zone). Isolines of frequency are drawn on maps showing
Alveolar pressure opposite change occurs. The lung alveoli collapse before air is expelled from them, The alveolar pressure rises to about +1 cm H2O. This forces the 500 ml of inspired air out of the lung during 2–3 seconds of expiration. By the end of expiration, the pressure drops gradually and become atmospheric again. Alveolar pressure Alveolar pressure (P) is the pressure of air inside the lung alveoli. When the glottis is opened and no air is flowing into or out of the lungs, alveolar pressure is equal (zero cmH2O). During inspiration, the increased volume of alveoli as a result of lung