Question

what are SI unit? what was the need to have this system of unit​

Answer 1

Answer:

The International System of Units is a system of measurement based on 7 base units: the metre (length), kilogram (mass), second (time), ampere (electric current), Kelvin (temperature), mole (quantity), and candela (brightness). These base units can be used in combination with each other. This creates SI derived units, which can be used to describe other quantities, such as volume, energy, pressure, and velocity.

The system is used almost globally. Only Myanmar, Liberia, and the United States do not use SI as their official system of measurement.[1] In these countries, though, SI is commonly used in science and medicine.

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Answer 2

Answer:-

SI unit:-

• The SI unit also defined as the International System of units.
• This system is most commonly used in scientific and also in technical research.

Need to have this system of unit:-

People in different countries may be using a different set of standard measurement units.

For the sake of uniformity, scientists all over the world have adopted a common set of units.

This system is called the International System of Units or the SI units.

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Know More:-

Measurement in early times:-

In early times people used different body parts to measure length.

• Hand Span
• Cubit
• Fathom

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Definitions:-

Hand Span:-

This is the distance between the tip of the thumb and the tip of the little finger.

Cubit:-

This is the distance between the tip of the middle finger (outstretched) and the elbow

Fathom:-

This is the length of the outstretched arms.

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