Science and Technology

Atmosphere Air is a mixture of different gases(oxygen, nitrogen, carbon dioxide, inert gases- helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), radon (Rn), oganesson (Og) etc, dust particles, and water vapour. The air contains the most nitrogen gas. Nitrogen gas is 78 percent in air. Similarly, oxygen gas is found in about 21 percent. Carbon dioxide(0.03), inert gases and other gases and water vapor are also found in the air. The earth is covered by a layer of air around it, called the atmosphere. The atmosphere consists of various gases, water vapor and dust particles. The nature of the atmosphere varies with altitude. As the altitude increases, so does the layer of the atmosphere decreases. The atmosphere is divided into the following five levels based on altitude: 1. Troposphere The lower troposphere is the lowest layer of the atmosphere. It is about 16 kilometers above the earth's surface. At this level, gases,...

Vitamin  Vitamin is organic compound which is totally different from the main nutrients (protein, carbohydrates, and, fat), very essential in minute amounts in the diet, whose absence may cause specific deficiency diseases. For normal nutrition and metabolism the body requires certain substances called vitamins. All living beings, plant or animal need vitamins for health, growth and reproduction. There are 13 different types of vitamins have been identified by nutritionists such as A, eight B-complex vitamins, C, D, E, and K. Kinds of Vitamins  The vitamins needed for humans are divided into two categories such as water soluble vitamins and fat soluble vitamins. A vitamins than can dissolve in water is called water soluble vitamins such as the vitamins B and C. And a vitamin that can dissolve in fat is called fat soluble vitamin such as vitamins A, D, E and K. Fat soluble vitamins A vitamin that can dissolve in fat is called fat soluble vitamin such as vitamins A, D, E and K....

Some Hypotheses About the Origin of the Earth  Scientists have come up with their own ideas. Some of the hypotheses are as follows: 1. Planetesimial Hypothesis The first theory of the origin of the earth was made in 1749 by George Buffon of France. According to his theory, a planet orbiting the universe long ago collided with the sun, splitting the sun and forming other planets and satellites, including the earth.  2. Nebular Hypothesis The nebula hypothesis, introduced by the German philosopher Kant in 1755, was modified by Laplace in 1796. According to him, about four and a half billion years ago, a vapor was floating in space. During this rotation, the body began to shrink and shrink, and then small pieces broke out of it. The pieces began to rotate around the large body. Thus the big body Sun and other small bodies were established as planets. 3. Tidal Theory In 1917, Jeans and Jeffrey hypothesized that in ancient times, a large star spun close to the sun. The star'...

Solar System Solar system and its components: the sun and planets  #Solar system A family consisting of planets, satellites and other small celestial bodies orbiting the sun and the sun is called a solar system. All the celestial bodies in the solar system revolve around the sun in their fixed orbits with the sun as the center. Under the influence of gravity between the sun and these celestial bodies, they are orbiting the sun. Large bodies orbiting the sun are called planets. A small object orbiting a planet is called a satellite. Along with these, infant planets (asteroids), comets, meteors, and meteorites also belong to the solar system. Our solar system is lies in the milky way galaxy which is spiral in shape. #The sun The main center of the solar system is the Sun. Other celestial bodies orbit the sun under the influence of gravitational force. The sun is a medium-sized star. It looks big only because it is close to the earth. It has its own heat and light power. It is e...

Science Note-Class 8 Unit-1 Measurement Type-1 Definition Measurement  = Measurement of unknown quantity with known quantity is called measurement.  Or knowing the exact amount of an object is called measurement. Physical Quantity  = A quantity that can be measured mathematically is called a physical quantity.  For example: area, mass, time, volume, etc.  Fundamental Unit  = A unit that does not depend on other units of measurement is called a basic unit.  For example: meter, kilogram, second etc. Derived Unit =  A unit that depends on a unit of other measurements or is made up of a basic unit is called a derived unit.  Caste: Jul, Newton, Watt, Pascal, etc. Mass  = Mass of matter in an object is called mass. 1 kg mass  = The lid lump made of platinum and iridium metal kept in the International Weights and Measures Department is called one kilogram mass. Weight  = The force that the earth pulls an objec...

   iPhone 12 Pro Max(rumored) price release date and features 2020 #Network • Technology=GSM / CDMA / HSPA / EVDO / LTE / 5G • 2G=bandsGSM 850 / 900 / 1800 / 1900 - SIM 1 & SIM 2 (dual-SIM) - for China CDMA 800 / 1900 • 3G=bandsHSDPA 850 / 900 / 1700(AWS) / 1900 / 2100 CDMA2000 1xEV-DO • 4G=bandsLTE • 5G=bandsSA/NSA/Sub6 • Speed=HSPA 42.2/5.76 Mbps, LTE-A 5G, EV-DO Rev.A 3.1 Mbps #Launch • Announced= Exp. Announcement 2020 September  • Status=Rumored exp. release 2020 September  #Body • Dimensions=7.4 mm thickness • Weight=226 Grams • Build=Glass front (Gorilla Glass), glass back (Gorilla Glass), stainless steel frame • SIM=Single SIM (Nano-SIM and/or eSIM) or Dual SIM (Nano-SIM, dual stand-by) - for China  IP68 dust/water resistant (up to 4m for 30 mins) Apple Pay (Visa, MasterCard, AMEX certified) #Display   • Type=Super Retina XDR OLED capacitive touchscreen, 1B colors • Size=6.7 inches, 110.3 cm2 • Resolution=1242 x 2688 pixels, 19.5:9 rat...

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