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The International System of Units (SI)has become the fundamental basis of scientific measurement worldwide. This system is an extension and refinement of the metric system, which is more superior and convenient than other systems. It provides one basic unit for each physical quantity. So, the 7 units of measurement are follow

**1. Mass **

The basic fundamental unit of mass is “**Kg”. **We also measure mass in Gram, Pound, Metric ton, Stone, Microgram, Carat, etc.

**2. Time **

The basic fundamental unit of Time is “Sec(s)”. We also express time in seconds, minutes, hours, days, weeks, years, etc

## 3. **Electric Current –**

The basic fundamental unit of Electric Current is “Ampere(A)”.

**4. Amount of Substance –**

The amount of Substance is a dimensionless expression of the number of particles in a particle or object. The basic fundamental unit of Amount of Substance is “**Mole**”. The amount of substance all called material quantity.

**5. Illumination**

The SI unit of Illumination is** “Candela”**. Candela is denoted by symbol ‘**cd**’. Some other units are lux, lumen, etc.

**6. Distance**

The SI unit of Distance is “**Meter**”. Distance also measures in mm, cm, km, yard, inch, foot, feet, etc.

**7. Temperature**

The SI unit of temperature is “**kelvin**”, expressed as the word “**K**”.Temperature 0 K is known as “absolute zero.”

We use two types of scale in measuring temperature that is –

1.Relative scales [Fahrenheit (°F) and Celsius (°C)]

2. Absolute scales [Rankine (°R) and Kelvin (K)].