Atmosphere of Earth the border between the atmosphere and outer space. Atmospheric effects become noticeable during atmospheric reentry of spacecraft at an altitude of around . Several layers can be distinguished in the atmosphere, based on characteristics such as temperature and composition. The study of Earth's atmosphere and its processes is called atmospheric science (aerology). Early pioneers in the field include Léon Teisserenc de Bort and Richard Assmann. The three major constituents of Earth's atmosphere are nitrogen, oxygen, and argon. Water vapor accounts for roughly 0.25% of the atmosphere by mass. The concentration of water vapor (a greenhouse gas) varies significantly from around
Endothermic gas gas in the endothermic atmosphere is combined with an additive gas including natural gas, propane (CH) or air and is then used to improve the surface chemistry work positioned in the furnace. There are two common purposes of the atmospheres in the heat treating industry: Principal Components of Endothermic Gas Generators : Chemistry of Endothermic Gas Generators: Applications of Endothermic Gas Generators: It is relatively simple to operate and maintain endothermic gas generators, however, maintenance such as the burnout process is often overlooked. Troubleshooting the Endothermic Gas Generator (Cracking at 1040°C): Endothermic gas Endothermic gas is a gas that inhibits