What is the metric system based upon?

Answer 1

Water: A litre of water has a volume of a cubic decimetre and wieghs a kilogram. It takes one joule of energy to heat a litre of water by one degree Celsius. Zero degrees Celsius is the freezing temperature of water and 100 degrees is the boiling temperature.

Another Answer

The SI System is based of seven units of measurements, called 'base units', based (for the most part) on physical constants,from which all other SI units (called 'derived units') are derived.

The base units are the metre (length), kilogram (mass), second (time), ampere (electric current), kelvin (temperature), candela (luminous intensity), and the mole (amount of substance).

Note that the original answer is incorrect, as the units litre and Celsius are not SI units, the kilogram is used to measure mass not weight, and the joule is not a base unit.

Answer 2

1889 kg of the International on a piece of metal in the "International Bureau of Weights and values" (BIPM) in the party is held on the outskirts of Paris, is defined.

The cylindrical construction of Great Britain, which is composed of 90% platinum and 10% iridium, a fixed and immutable as the stars of heaven Mftkhranh were described.

The cylindrical box with a glass in the S·hjdarh Protected Safe is held in a building.

But the shocking discovery occurred in 1992: the kilogram is known that there was no other way.

"This change may be due to surface effects, or dirt is out of gas phase.

Reduce or increase the mass of the kilogram is the only issue related to scientific curiosity.

This Asas·hay pounds of "international system of units" (SI), the most common units of measurement in everyday life, precision engineering, science and business.

Seven "basic unit" SI includes kilograms, meters, second, ampere, kelvin, mole and candela are the other units are derived from it.

But unlike other units kg, the last one is still based on a material object is defined.

This was considered a ruler of the world's platinum standard meters, but later it proved to be a fundamental, 100 cm long light takes to follow, were replaced. Meters of steel still banquet is held, but is no longer a museum piece.

After a long delay has now decided to pound the drum Nhnd aside.

If everything goes well, a fixed amount based on Planck's constant, it will be replaced. The name of the name of Max Planck, the grandfather of quantum physics is that quantum theory, first expressed in 1899.

Planck's constant h in equations with the letter is displayed, the smallest packet of energy, or quantum, the two particles can exchange their points.

"General Conference of Weights and values" (CGPM) on October 21 this year agreed to use this constant to calculate the amount of pounds.

But this replacement before 2014, when the experience to evaluate the accuracy of measurement techniques to ensure their accuracy to 20 parts per billion is finished, will be made.

If Planck's constant, is used to define the kilogram, nothing in life will not change. The pound will remain as a pound.

The press release announcing the conference: "The immediate effect of these changes, however, extremely precise measurements will be performed in highly specialized laboratories.

Answer 3

Metric. The underlying principal of the metric system is that everything is in powers of 10, e.g 1kg=10^3g, unlike the imperial system, where 1ft=12in. This makes it simpler to convert measurements. For example, I can immediately calculate in my head that 0.937kg is 937g, but I would require a calculator to convert 0.937ft into inches.

Answer 4

Metric System in 1799, in France. This system based on criteria like proved too much land or water properties have been established and has been used.

Answer 5

10