Definition: A fundamental physical quantity; one of the seven SI base quantities from which all the derived physical quantities are formed. The SI base unit of mass is the kilogram.
Weight and mass are different physical quantities and should not be confused. Weight is a quantity of force exerted by an object due to external interaction with its surroundings like gravity. The weight of an object will vary depending on its environment; an object will weigh less on the moon and more if accelerated upwards in a lift. The mass of an object is a fundamental quantity and its value will not change with changes in environment. In static every day life on earth the value of weight and mass are very similar.
To use the measurement conversion calculators simply enter a number value into the desired field and click calculate. All results shown will be equivalent values. Values are given to seven significant figures ( the odd result may show 9's or 0's over running). Values of 10 000 or greater will be displayed in the e-format e.g. 2.3456e7 which equals 2.3456 x 107 or 23 456 000. Values lower than 0.001 will be displayed in the e-format e.g. 2.3456e-5 which equals 2.3456 x 10-5 or 0.000 023456. The calculators require that your browser has java script enabled. View all measurement unit conversion calculators on the same page (may not work with all browsers; requires Iframe).