An electron volt is defined as the amount of kinetic energy gained by an electron when it accelerates through an electrostatic potential difference of one volt. MeV is 1 million electron volts, GeV is a billion (a thousand million) electron volts and TeV is a trillion (a million million) electron volts. Particle masses are generally quoted in electron volts (eV). Note the degrees symbol (°) is not generally used for Kelvins. A change of 1Kelvin equals a change of 1☌ or 1.8☏. Zero Kelvin (0K), also call Absolute Zero, is -273.15 Celsius (☌) and -459.67 Fahrenheit (☏). I quote most temperatures in Kelvins (K). Note that all distances quoted here assume a value of ~71 km/sec/Mpc for the Hubble Constant, although the latest WMAP figure is 70.5 ☑.3 km/sec/Mpc. However, due to the "stretching" of space, the radius of the observable universe is approximately 14 Gpc (46.5 billion light-years), although no one knows how far the universe extends beyond that. The Universe is approximately 13.75 billion years old. A Kiloparsec (Kpc) is 1,000 parsecs, Megaparsec (Mpc) is a million parsecs and a Gigaparsec (Gpc) is one billion parsecs. It first came into use in 1913, and is abbreviated to "pc". 1 parsec is approximately 3.26156 light-years a little over 3¼ light-years. The word parsec comes from the " par allax of one arc sec ond", and is the distance from the Earth to a star or other astronomical object that subtends a parallax angle of one arc second when viewed from Earth. On larger intergalactic scales, astronomers generally use the parsec, megaparsec or gigaparsec. Light-years are used generally only for intragalactic measurements. The long scale is still used outside of scientific circles in most of Europe, however.Īstronomical distance is expressed in either Light-Years, or Parsecs. The US has always used the short scale, and the UK officially moved to it in 1974. Beyond those two, I always use the exponent numbering system described above. Thus, one billion is 1,000 million or 10 9, and one trillion is 1,000 billion or 10 12. I use the short scale numbering system that increases from a million by factors of 1,000. This becomes very important when trying to express really large or really small numbers. I use scientific notation extensively, where the superscript represents the number of decimal places moved to the right, if positive, or the number of decimal places moved to the left, if negative. An approximate way to convert km to miles is take half the km value, then add one quarter of the result for example, 200 km is 100 + 25 = 125 miles, and 74 km is 37 + 9.25 = 46.25 miles. A km is approximately 0.625 of a mile, and a mile is approximately 1.6 km. In the future, therefore, I plan to give distances only in metric units, unless there is some specific reason not to do so. The metric scale is used pretty much everywhere outside the US, and is used by scientists in the US. In the past, I have tried to quote distances in both metric (kilometers, meters, cms) and Imperial (miles, feet, inches) units. You can also get the formula used in Parsec to Light Year conversion along with a table representing the entire conversion.For anyone not familiar with scientific terminology, I have defined some of the terminology and concepts that I use. If you encounter any issues to convert, this tool is the answer that gives you the exact conversion of units. Converting Parsec to Light Year is easy, for you only have to select the units first and the value you want to convert. When you are converting length, you need a Parsecs to Light Years converter that is elaborate and still easy to use. helps in the conversion of different units of measurement like pc to ly through multiplicative conversion factors. Be it buying grocery or cooking, units play a vital role in our daily life and hence their conversions. Measurement like length finds its use in a number of places right from education to industrial usage. Units of measurement use the International System of Units, better known as SI units, which provide a standard for measuring the physical properties of matter.
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