# Beta version

BETA TEST VERSION OF THIS ITEM

This online calculator is currently under heavy development. It may or it may NOT work correctly.

You CAN try to use it. You CAN even get the proper results.

However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.

Feel free to send any ideas and comments !

This online calculator is currently under heavy development. It may or it may NOT work correctly.

You CAN try to use it. You CAN even get the proper results.

However, please VERIFY all results on your own, as the level of completion of this item is NOT CONFIRMED.

Feel free to send any ideas and comments !

# Basic SI units

Name | Symbol | Measure |

metre | Show source$m$ | length |

kilogram | Show source$kg$ | mass |

second | Show source$s$ | time |

ampere | Show source$A$ | electric current |

kelvin | Show source$K$ | thermodynamic temperature |

mole | Show source$mol$ | amount of substance |

candela | Show source$cd$ | luminous intensity |

# Selected derived units

Name | Symbol | Measure |

radian | Show source$rad$ | angle |

steradian | Show source$sr$ | solid angle |

hertz | Show source$Hz$ | frequency |

newton | Show source$N$ | force |

pascal | Show source$Pa$ | pressure, stress |

joule | Show source$J$ | energy, work, heat |

watt | Show source$W$ | power, radiant flux |

coulomb | Show source$C$ | electric charge or quantity of electricity |

volt | Show source$V$ | voltage (electrical potential) |

farad | Show source$F$ | capacitance |

ohm | Show source$\Omega$ | resistance, impedance, reactance |

siemens | Show source$S$ | electrical conductance |

weber | Show source$Wb$ | magnetic flux |

tesla | Show source$T$ | magnetic flux density |

henry | Show source$H$ | inductance |

Celsius degree | Show source$^{\circ}C$ | temperature relative to 273.15 K |

lumen | Show source$lm$ | luminous flux |

lux | Show source$lx$ | illuminance |

becquerel | Show source$Bq$ | radioactivity (decays per unit time) |

gray | Show source$Gy$ | absorbed dose (of ionizing radiation) |

sievert | Show source$Sv$ | equivalent dose (of ionizing radiation) |

katal | Show source$kat$ | catalytic activity |

square meter | Show source$m^2$ | area |

cubic meter | Show source$m^3$ | volume |

meter per second | Show source$\frac{m}{s}$ | velocity |

meter per square second | Show source$\frac{m}{s^2}$ | acceleration |

kilogram per cubic meter | Show source$\frac{kg}{m^3}$ | density |

newton per square meter | Show source$\frac{N}{m^2}$ | specific gravity |

volt per meter | Show source$\frac{V}{m}$ | magnitude of the electric field |

ampere per meter | Show source$\frac{A}{m}$ | magnitude of the magnetic field |

# Some facts

- To determine the quantity/value/amount of the selected physical quantity (e.g. mass), we need
**a standard definition of the unit**relative to which we compare quantities. We call this standard**a unit of measure**. - Theoretically, there is freedom in the selection of units of measurement, but for practical reasons, they are chosen in such a way that the usage of them is practical and easy.
- In order to standardize, units of measurement are grouped in the so-called
**measurement unit systems**. Currently, in most regions of the world, the applicable unit of measurement system is**SI system**. - An example of a unit of measure is a kilogram. When making a mass measurement, we determine
**how many times heavier**or**how many times lighter**the**examined body is relative to the prototype body with known mass of 1kg**. Perhaps the most direct example of such a measurement is the use of a weighing scale, where we place the examined object on one side and prototype weight on another. - In the case of a kilogram, the unit of measure is defined by a physically existing object, but this is not always possible. For example, one second is defined as a time equal to 9 192 631 770 periods corresponding to the transition between two levels F=3 and F=4 basic state S
_{1/2}of atom ces^{133}Cs.

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