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# Metric System of Measurement

## Let us understand what metric system is

The standard way to calculate dimensions of an object, find its volume or calculate distance, time, and speed of anything is done by measuring quantities in metric units. For example, if we want to measure the distance between your house and your best friend’s house, then we will take a standard unit to do the same. It can be meters, yards, miles, etc.

Most of the quantities present around are measurable if their quantity is small. For example, milk, apples, potatoes, etc., are all measurable quantities by units. Whereas sugar, salt, air, etc., can be measured as a whole. While some quantities, like water in oceans, how many planets are there in the universe, how many stars are there in the galaxy, etc., are non-measurable.

We can calculate the length and breadth of a two-dimensional object. We can calculate the volume of a three-dimensional object by multiplying the area of a two-dimensional object by its length. We can estimate time and distance with respect to the planetary positions on earth. All these units can be measured in a metric system.

## Fun fact:

1. International system of units, known as SI units, started implementing the metrication process. These units are followed by almost every country to maintain global understandings of units.
2. The metric units followed in America are known as United States Customary Units (USCS).

## Difference between SI units and USCS units

 Measurement SI USCS Distance Metre Foot, yard, inch Volume Litre Quart, tablespoon, gallon Mass Gram Slug Force Newton Pound, ton, ounce Time Second Second Electric current Ampere Ampere Energy Joule Foot-pound Temperature Kelvin or Celsius Fahrenheit

## Length

Length is a quantity used to measure size of an object or a particular distance between various objects. The standard unit to measure length is meter.

## Metric conversion of length

 kilometer hectometer decameter meter decimeter centimeter millimeter 1000 100 10 1 0.1 0.01 0.001

Example: Convert 20 cm into m.
Solution:
We know, 0.01 m = 1 cm
This implies, 20 cm = 20 x 0.01 = 0.2m

## Weight

Weight denotes the mass of an object. Whenever we need to measure the quantity of an object or commodity, we use weight. The SI unit of weight is gram. We can measure weight by using a weight balance or weighing scale.

## Metric conversion of weight

 kilogram hectogram decagram gram decigram centigram milligram 1000 100 10 1 0.1 0.01 0.001

## Example: Convert 20 milligrams into kilograms.

Example: Convert 20 milligrams into kilograms.
Solution:
We know, 1 milligram = 0.001 g
Therefore, 20 milligram = 20 x 0.001 = 0.02 g
Also, 1000 gm = 1 kilogram
Therefore, 0.02 / 1000 = 0.000002 kilogram

## Capacity

Capacity denotes the volume of an object. Whenever we want to measure the volume or quantity holding capacity of an object, we need to find its volume. Volume can be found only in three-dimensional objects, like cube, cuboid, prism, etc. For example, the volume of a cube is the product of its length, breadth and height = side3. It is denoted by cm3, m3, etc. The SI unit to measure capacity is litre.

## Metric conversion of capacity

 kilolitre hectolitre decalitre litre decilitre centilitre millilitre 1000 100 10 1 0.1 0.01 0.001

## Metric unit conversion of time

 Unit Value 1 minute 60 seconds 1 hour 60 minutes 1 day 24 hours 1 week 7 days 1 year 365 days 1 leap year 366 days
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