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2. Irreducible fraction - Wikipedia

   en.wikipedia.org/wiki/Irreducible_fraction

   An irreducible fraction (or fraction in lowest terms, simplest form or reduced fraction) is a fraction in which the numerator and denominator are integers that have no other common divisors than 1 (and −1, when negative numbers are considered). [1]

3. Per-unit system - Wikipedia

   en.wikipedia.org/wiki/Per-unit_system

   The base value should only be a magnitude, while the per-unit value is a phasor. The phase angles of complex power, voltage, current, impedance, etc., are not affected by the conversion to per unit values. The purpose of using a per-unit system is to simplify conversion between different transformers.

4. Microsoft Excel - Wikipedia

   en.wikipedia.org/wiki/Microsoft_Excel

   In the figure, the fraction 1/9000 is displayed in Excel. Although this number has a decimal representation that is an infinite string of ones, Excel displays only the leading 15 figures. In the second line, the number one is added to the fraction, and again Excel displays only 15 figures. In the third line, one is subtracted from the sum using ...

5. Dimensional analysis - Wikipedia

   en.wikipedia.org/wiki/Dimensional_analysis

   Two different units of the same physical quantity have conversion factors that relate them. For example, 1 in = 2.54 cm; in this case 2.54 cm/in is the conversion factor, which is itself dimensionless. Therefore, multiplying by that conversion factor does not change the dimensions of a physical quantity.

6. Earth's energy budget - Wikipedia

   en.wikipedia.org/wiki/Earth's_energy_budget

   Earth's energy budget includes the "major energy flows of relevance for the climate system". [2] These are "the top-of-atmosphere energy budget; the surface energy budget; changes in the global energy inventory and internal flows of energy within the climate system".

7. Carbon cycle - Wikipedia

   en.wikipedia.org/wiki/Carbon_cycle

   Carbon cycle schematic showing the movement of carbon between land, atmosphere, and oceans in billions of tons (gigatons) per year. Yellow numbers are natural fluxes, red are human contributions, and white are stored carbon.