[
  {
    "quantity": "length",
    "unit": "metre",
    "symbol": "m",
    "definition": "The metre is defined by fixing the numerical value of the speed of light in vacuum c to be exactly 299 792 458 when expressed in m/s."
  },
  {
    "quantity": "mass",
    "unit": "kilogram",
    "symbol": "kg",
    "definition": "The kilogram is defined by fixing the numerical value of the Planck constant h to be exactly 6.626 070 15 × 10⁻³⁴ when expressed in J·s (kg·m²·s⁻¹)."
  },
  {
    "quantity": "time",
    "unit": "second",
    "symbol": "s",
    "definition": "The second is defined by fixing the numerical value of the caesium-133 hyperfine transition frequency ΔνCs to be exactly 9 192 631 770 when expressed in Hz (s⁻¹)."
  },
  {
    "quantity": "electric current",
    "unit": "ampere",
    "symbol": "A",
    "definition": "The ampere is defined by fixing the numerical value of the elementary charge e to be exactly 1.602 176 634 × 10⁻¹⁹ when expressed in C (A·s)."
  },
  {
    "quantity": "thermodynamic temperature",
    "unit": "kelvin",
    "symbol": "K",
    "definition": "The kelvin is defined by fixing the numerical value of the Boltzmann constant k to be exactly 1.380 649 × 10⁻²³ when expressed in J/K (kg·m²·s⁻²·K⁻¹)."
  },
  {
    "quantity": "amount of substance",
    "unit": "mole",
    "symbol": "mol",
    "definition": "The mole is defined by fixing the numerical value of the Avogadro constant NA to be exactly 6.022 140 76 × 10²³ when expressed in mol⁻¹."
  },
  {
    "quantity": "luminous intensity",
    "unit": "candela",
    "symbol": "cd",
    "definition": "The candela is defined by fixing the numerical value of the luminous efficacy of monochromatic radiation of frequency 540 × 10¹² Hz (Kcd) to be exactly 683 when expressed in lm/W (cd·sr·kg⁻¹·m⁻²·s³)."
  }
]