What is at the heart of the SI standard?

The SI is defined in terms of a set of 7️⃣ defining constants:
1️⃣the caesium hyperfine frequency
2️⃣the speed of light in vacuum
3️⃣the Planck constant
4️⃣the elementary charge
5️⃣the Boltzmann constant
6️⃣the Avogadro constant
7️⃣the luminous efficacy of a defined visible radiation

The complete system of units can be derived from the fixed values of these defining constants, expressed in the units of the SI.

The 7️⃣ base units are:
1️⃣Second (s), unit of time
2️⃣Meter (m), unit of length
3️⃣Kilogram (kg), unit of mass
4️⃣Ampere (A), unit of electric current
5️⃣Kelvin (K), unit of thermodynamic temperature
6️⃣Mole (mol), unit of an amount of substance
7️⃣Candela (cd), unit of luminous intensity

The SI standard also includes units that are derived from the base units and are defined as products of powers of the base units. For example, one derived unit is the newton, which can be expressed in terms of base units as 1 kg m/s2.

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