Question

please give definition of the following (short definition)

1) meter
2) second
3) kilogram (kg)
4)Kelvin
5) Ampere
6)candela
7)mole

Please help me
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Answer 1

Answer:

Mole What..................

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Answer 2

Answer:

(1)The metre is defined as the length of the path travelled by light in a vacuum in 1299 792 458 of a second. The metre was originally defined in 1793 as one ten-millionth of the distance from the equator to the North Pole along a great circle, so the Earth's circumference is approximately 40000 km.

(2) The second is the base unit of time in the International System of Units, commonly understood and historically defined as ¹⁄₈₆₄₀₀ of a day – this factor derived from the division of the day first into 24 hours, then to 60 minutes and finally to 60 seconds each.

(3) The kilogram is the base unit of mass in the metric system, formally the International System of Units, having the unit symbol kg. It is a widely used measure in science, engineering and commerce worldwide, and is often simply called a kilo in everyday speech.

(4) The kelvin is the base unit of temperature in the International System of Units (SI), having the unit symbol K. ... The Kelvin scale fulfills Thomson's requirements as an absolute thermodynamic temperature scale. It uses absolute zero as its null point.

(5) The ampere, often shortened to "amp", is the base unit of electric current in the International System of Units. It is named after André-Marie Ampère, French mathematician and physicist, considered the father of electrodynamics

(6) Candela (cd), unit of luminous intensity in the International System of Units (SI), defined as the luminous intensity in a given direction of a source that emits monochromatic radiation of frequency 540 × 1012 hertz and has a radiant intensity in that same direction of 1/683 watt per steradian (unit solid angle).

(7) The mole is the unit of measurement for amount of substance in the International System of Units. A mole of a substance or a mole of particles is defined as exactly 6.02214076×10²³ particles, which may be atoms, molecules, ions, or electrons. In short, for particles 1 mol = 6.02214076×10²³.

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