Day: November 23, 2022

International System of Units (SI)

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The International System of Units, known by the international abbreviation SI, is the modern form of the metric system. It is the only system of units in which all seven base units are defined by international agreement. The SI was first published in 1960 and has been revised several times since then. The most recent … Read more

Temperature

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The SI Unit of temperature is Kelvin. The Kelvin scale is an absolute scale, meaning that it starts at absolute zero. Absolute zero is the point at which all thermal motion ceases. The Kelvin scale has no negative numbers, so temperatures can only be expressed as positive values. The Celsius and Fahrenheit scales are both … Read more

Time

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The SI Unit for time is the second. The second is defined as the duration of 9,192,631,770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium-133 atom. In other words, a second is an extremely precise measure of time that allows us to keep … Read more

Newton

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The SI Unit of force is the Newton (N), which is equal to the amount of force required to accelerate a one-kilogram mass at a rate of one meter per second squared. The newton can be divided into smaller units like the dyne, but these are not commonly used in everyday measurement. In general, anything … Read more

Candela

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Candela (cd) is an SI Unit for luminous intensity in the International System of Units (SI). It is equal to the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540×1012 hertz and that has a radiant intensity in that direction of 1/683 watt per steradian. The name “candela” … Read more

Mol

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A mole or (mol) is a SI Unit of measurement in the metric system. One mole of a substance has a mass equal to its atomic or molecular weight in grams. The number of particles in one mole of a substance is called Avogadro’s number, which is about 602 sextillion. Moles are used for measuring … Read more