Name the number that is the basis for the Metric System and SI System of Measurement.?

Answer 1

SI base units
The SI is founded on seven SI base units for seven base quantities assumed to be mutually independent, as given in Table 1.


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Table 1. SI base units
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SI base unit
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Base quantity Name Symbol
length meter m
mass kilogram kg
time second s
electric current ampere A
thermodynamic temperature kelvin K
amount of substance mole mol
luminous intensity candela cd


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For detailed information on the SI base units, see Definitions of the SI base units and their Historical context.

SI derived units

Other quantities, called derived quantities, are defined in terms of the seven base quantities via a system of quantity equations. The SI derived units for these derived quantities are obtained from these equations and the seven SI base units. Examples of such SI derived units are given in Table 2, where it should be noted that the symbol 1 for quantities of dimension 1 such as mass fraction is generally omitted.

Answer 2

10

Answer 3

It all started with the desire to make things divisible by 10 (and powers of 10).

In the old days (way before calculators), it was important to have numbers that were divisible by many other numbers. That is how we ended up with 12 hours in the daytime (sunrise to sunset) and, later, another 12 for night-time (for a 24-hour day).
12 is divisible by 2, 3, 4 and 6.
6 is a magic number (divisible by 1, 2 and 3)

The next "magical-like" number is 60 (divisible by 2, 3, 4, 5, 6, 10, 12, 15...). So when small portions of some unit were needed, the unit was divided into 60 smaller parts.

This is how we ended up with 60 minutes in an hour and 60 seconds in a minute.

The year lasts 365.25 days (approx.). Cutting the circle up in 365,25 portions is not very practical for calculations (although the Chinese did it for almost a thousand years).

In the civilizations that preceded ours, the circle was cut into 360 portions (6*60, the two magical numbers).

Powers of 2 was another popular way to apportion units.
For example, 2 cups is one pint, 2 pints is one quart, 4 quarts (2*2) is a gallon. In the UK, they used 10 ounce cups, hence the 40 ounce quart. In the US, they used 8 ouce cups (because you can divide by 2 more often: 8 - 4 - 2 - 1), hence the 32 ounce quart.

But many of these measures were based on small regional things that were not very international.

The British went and measured the Earth's circumference. Then, dividing this circumference by 360 (to get one degree's worth) and again by 60 (to get one arc-minute's worth), they used that length to create the nautical mile.

Meanwhile, the French (who invented the first mechanical calculators) wanted to base their unit divisions on 10 (we have ten fingers and our counting system uses "base-ten" digits).

The circle was divided into 400 grades (a right angle becomes 100 grades) and each grade is divided into 100 centigrades. They measured the Earth's circumference, divided it into 400 portions (the grades) and divided one portion into 100 smaller portions. The length of one centigrade on Earth's surface became the kilometre (and the metre, perforce, was one thousandth of that).

Take pure water, fill a tank of exactly one cubic metre. The water in the tank has a mass of exactly one tonne.
Take 1/1000 of the cubic metre, that is one litre of water, with a mass of 1 kilogram. Divide again by 1000, you now have a cubic centimetre of water , a "cc" (better name is a millilitre) and that water has a mass of 1 gram.

And they just continued that way, creating a system of units where all measurements were linked, and all divisible by powers of 10.

Answer 4

100

Answer 5

Powers of 10!!!!!!

Answer 6

10, centi
100, mili
1000, kilo

Answer 7

Ten