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  1. Cetylpyridinium chloride ionize in water to form positively charged cetylpyridinium and negatively charged chloride ions. As bacterial cell wall is negatively charged, the positively charged ions of cetylpyridinium are adsorbed on the cell wall making it positively charged. Subsequent treatment withRead more

  1. The distinction is that they are titles awarded by different space agencies. They both mean essentially the same thing and they both come from Greek. Cosmonaut is used by the Russian Space Agency. Astronaut is used by NASA, ESA, CSA, and JAXA. An astronaut or cosmonaut (Russian) is a person trainedRead more

  1. As the water freezes, it wants to form a regular crystalline structure (ice). That means impurities like oxygen and other dissolved gasses are pushed away from the crystallization front into the remaining liquid. This means that the last parts of the ice cube to crystallize end up with most of the iRead more

  1. When a car hits something, it starts to decelerate (lose speed) very rapidly. An accelerometer (electronic chip that measures acceleration or force) detects the change of speed. If the deceleration is great enough, the accelerometer triggers the airbag circuit. Normal braking doesn't generate enoughRead more

  1. Electronic Voting Machine (also known as EVM) is voting using electronic means to either aid or take care of the chores of casting and counting votes. An EVM is designed with two units: the control unit and the balloting unit. These units are joined together by a cable. The control unit of the EVM iRead more

  1. A ‘green’ printed circuit board is not actually green all the way through. The only green part is the outer covering of resin called the solder mask or solder resist/oil. This is a hardened resin with colored pigments that is applied to the boards in a silkscreen fashion. The purpose of solder maskRead more

  1. We have been told, since time immemorial, that the liver was the biggest internal organ in the human body, making the skin the largest external one. Weighing about 8 pounds (3.6 kilograms) and covering 22 square feet (2 square meters) in some cases, the versatile skin has been considered the largestRead more

  1. The Consumer Price Index (CPI) is a measure that examines the weighted average of prices of a basket of consumer goods and services, such as transportation, food, and medical care. It is calculated by taking price changes for each item in the predetermined basket of goods and averaging them. ChangesRead more

  1. The United Nations Framework Convention on Climate Change (UNFCCC) is an international environmental treaty adopted on 9 May 1992 and opened for signature at the Earth Summit in Rio de Janeiro from 3 to 14 June 1992. It then entered into force on 21 March 1994, after a sufficient number of countriesRead more