Aerology
The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity. The atmosphere of Earth protects life on Earth by creating pressure allowing for liquid water to exist on the Earth's surface, absorbing ultraviolet solar radiation, warming the surface through heat retention (greenhouse effect), and reducing temperature extremes between day and night (the diurnal temperature variation). By volume, dry air contains 78.09% nitrogen, 20.95% oxygen,[2] 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases. Air also contains a variable amount of water vapor, on average around 1% at sea level, and 0.4% over the entire atmosphere. Air content and atmospheric pressure vary at different layers, and air suitable for use in photosynthesis by terrestrial plants and breathing of terrestrial animals is found only in Earth's troposphere and in artificial atmospheres. The atmosphere has a mass of about 5.15×1018 kg,[3] three-quarters of which is within about 11 km (6.8 mi; 36,000 ft) of the surface. The atmosphere becomes thinner and thinner with increasing altitude, with no definite boundary between the atmosphere and outer space. The Kármán line, at 100 km (62 mi), or 1.57% of Earth's radius, is often used as the border between the atmosphere and outer space. Atmospheric effects become noticeable during atmospheric reentry of spacecraft at an altitude of around 120 km (75 mi). Several layers can be distinguished in the atmosphere, based on characteristics such as temperature and composition.
Electrical Engineering book guideline
Aspirants who are pursuing Electrical Engineering From various states. Check all the V K Mehta Electrical Engineering Books For the better scoring in the Exam. Here we provide detailed information about How to Download the all the V K Mehta Books Free Online. Aspirants those who are looking for the Electrical Engineering Books List can get all the Objective Electrical Engineering Books Free Download. V K Mehta is one of the best series of the Books. Students can get all the B.E and B.Tech 1st Year, 2nd Year, 3rd Year and Final Year Electrical Engineering Books Semester Wise. Principles of Power Systems V.K Mehta has made the Best Book For the Exams. For the Subject base, we provide the VK Mehta has been Including Neutral Grounding. Rohit Mehta and VK Mehta Text Book of Electrical Technology with Volume 2 DC and AC Machines Topics Covered. AC and DC Machines are the Part of Electrical Technology. This subject Electrical Technology is like a Basic Electrical Engineering, Electronics Control Systems. By following these candidates can get the Basic Electrical Engineering Theme.
Happiness
Description on happiness
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