troposphere The lowest level of a planetary atmosphere where convection keeps the gas mixed. In the case of Earth's atmosphere, the troposphere extends up to a height of 10 to 16 kilometers. Its temperature decreases steadily with altitude from about 290 K to 240 K at a rate of about 6.5 K per km. Almost all the atmospheric water vapor and weather systems occur here. Related category ATMOSPHERIC PHENOMENA AND STRUCTURES Also on this site: Encyclopedia of Alternative Energy & Sustainable Living Encyclopedia of History Transport Concepts & Designs (partner site) |