Why basic quantity of mass contain with prefix (whth k )?

Units: CGS and MKS

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Originally Posted by KeepItSimpleStupid

Units: CGS and MKS

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Why they don't use "g"?

and I quote "In 1954, the Tenth General Conference on Weights and Measures (CGPM) adopted the meter, kilogram, second, ampere, degree Kelvin, and candela as the basic units for all international weights and measures".

There is a system of units using centimeters, grams and seconds - called CGS.

Centimetre gram second system of units - Wikipedia, the free encyclopedia

Internationally the MKS (meters, killograms and seconds) has been adopted as a Standard. That's what the link was supposed to convey.

Here is yet another reference: Metric system - Wikipedia, the free encyclopedia

With prefixes such as kilo and centi. Another way to look at things is people like to work with small numbers. Acceleration due to gravity is 9.8 m/s^2. Would you rather use 980 cm/s^2?

Would you rather talk about 10 uA or 10e-6 amps?

Signs are left out of certain things because they are "understood". A 10 MW power plant has to be a -10 MW power plant, because power is defined as the energy DISSIPATED, not generated. You have to use the negative number in calculations.

When doing solar cell measurements Jsc is negative, but the sign is often omitted.

Conventional current flows from the positive terminal to the negative terminal, but electrons go the other way because somebody goofed. It matters in solid state physics where holes are used for "conventional current". It also matters in electrolysis experiments in Chemistry.

One unit that gets blown out of propportion is the Pascal.
32 pound/square inch = 220 632.232 96 pascal which is around the pressure in your tire in your car. Would you rather work with 32 PSI or 220,632 Pascals?



My answer wasn't blatently wrong and the disagree was unwarranted.

KISS - you are to applauded for figuring out what the OP was asking about! I read the OP's post:

"Why basic quantity of mass contain with prefix (whth k )?"

And just skipped right on by, as I had absolutely no idea what he was talking about, So kudos for figuring out that he was asking about CGS versus MKS systems.