SI units

The Système International sets several standard units and prefixes.

Units:

• Seconds (s), for time
• Metres (m), for length
• Kilograms (kg), for mass
• Ampere (A), for current
• Kelvin (K), for temperature
• Moles (mol), for amounts of substances
• Candelas (cd), for luminous intensity

Prefixes:

• $10^{-12}$: pico (p)
• $10^{-9}$: nano (n)
• $10^{-6}$: micro ($\mu$)
• $10^{-3}$: milli (m)
• $10^3$: kilo (k)
• $10^6$: mega (M)
• $10^9$: giga (G)
• $10^{12}$: tera (T)