# Prefix

Use of prefixes instead of exponents

## Description

In the RedCrab Calculator prefixes can be used instead exponents.

The term 2·103 can be replaced by 2k.

22·10-6 kann durch 22µ ersetzt werden

Before entering a prefix symbol, press the ESC key. Pressing the ESC key marks the following character as a prefix and avoids conflicts with variable names. This also means that the same letters for variables and prefixes can be used on the worksheet. Prefixes are displayed in gray to distinguish them from variables..

Available from version 7.9

## Example

Calculation of an impedance according to the formula $$\displaystyle X_C=\frac{1}{2π·f·C}$$
For $$f$$ is assumed 2.5 kHz and for $$C$$ 22µF.

#### Calculation with exponents

$$\displaystyle X_C=\frac{1}{2π·2.5·10^3·22·10^{-6}}$$

#### Calculation with prefixes

$$\displaystyle X_C=\frac{1}{2π·2.5k·22µ}$$

## List of prefixes

The SI prefixes are standardized by the International Bureau of Weights and Measures (IBWM)

The list below shows the prefixes which RedCrab used

 Y Yotta 1024 1.000.000.000.000.000.000.000.000 Quadrillion Septillion Z Zetta 1021 1.000.000.000.000.000.000.000 Trilliarde Sextillion E Exa 1018 1.000.000.000.000.000.000 Trillion Quintillion P Peta 1015 1.000.000.000.000.000 Billiarde Quadrillion T Tera 1012 1.000.000.000.000 Billion Trillion G Giga 109 1.000.000.000 Milliarde Billion M Mega 106 1.000.000 Million k Kilo 103 1000 Thousand m Milli 10-3 0,001 Thousandth μ Mikro 10-6 0,000.001 Millionth n Nano 10-9 0,000.000.001 Milliardth Billionth p Piko 10-12 0,000.000.000.001 Billionth Trillionth f Femto 10-15 0,000.000.000.000.001 Billiardth Quadrillionth a Atto 10-18 0,000.000.000.000.000.001 Trillionth Quintillionth z Zepto 10-21 0,000.000.000.000.000.000.001 Trilliardth Sextillionth y Yokto 10-24 0,000.000.000.000.000.000.000.001 Quadrillionth Septillionrh