In 1586, a Flemish mathematician Simon Stevin published a small booklet in which he introduced the decimal system. The first secretary of Royal Society gave the idea to introduce the metric system in 1668. Metric system is the system in which all the units, which measures the physical quantity, are expressed in some other units. In the metric system chart we can find that how we convert one unit system into another. A french Academy completed the task to make the metric system. After some time on 20 th May 1875, seventeen states signed the international system of measurements of fundamental physical quantities.
In metric system chart, the length can be measured in meter, mass
can be measured in kilogram, time can be measured in second, temperature
can be measured in kelvin. These units are the standard units in the
metric system chart.
The Greek word metron is the generator of word meter. The word
metron means the measurement. There were two very competing approaches
to define the meter at the time of defining the metric system. The
first approach suggestion is, one meter is the length of that pendulum
whose half of the time period is one second. Other suggestion is the one
ten millionth of the length of earth’s meridian along its quadrant. At
last the length of a platinum iridium rod under some specific conditions
is taken as to be one meter. Accordingly, one millimeter is defined as
one thousandth part of the length of that platinum iridium rod which is
kept at particular temperature conditions.
Initially, one gram was defines as the mass of one cubic
centimeter(a cube of 1 cm in length) of water at the 4° C temperature.
Similarly, the definition of one kilogram is the mass of one cubic
decimeter of water kept at 4° C temperature. After that finally, we
define the mass of platinum iridium cylinder kept at particular
temperature conditions. Accordingly one gram is defines as the one
thousandth part of the mass of that platinum iridium cylinder kept at
particular temperature conditions. Accordingly one gram is defines as
the one thousandth part of the mass of that platinum iridium cylinder.
The following ladder shows that how we convert one metric unit into
another. These are the very known and commonly used units.