| Acidity/alkalinity | pH | pH |
| Area | hectare | ha |
| | square metre | m2 |
| | square kilometre | km2 |
| Concentration | grams per litre | g/L |
| | parts per million | ppm |
| | parts per billion | ppb |
| | parts per thousand | ppt |
| | micrograms per cubic metre | µg/m3 |
| | micrograms per decilitre | µg/dL |
| | tonnes per hectare | t/ha |
| Electrical conductivity | microsiemens per centimetre | µS/cm |
| Length | micrometre | µm |
| | millimetre | mm |
| | centimetre | cm |
| | metre | m |
| | kilometre | km |
| Mass | microgram | µg |
| | kilogram | kg |
| | tonne | t |
| | megatonne | Mt |
| | gigatonne | Gt |
| Power | megawatt | MW |
| | gigawatt | GW |
| | kilowatt hour | kWh |
| | megawatt hour | MWh |
| | gigawatt hour | GWh |
| Velocity and speed | kilometres per hour | km/hr |
| Volume | cubic metre | m3 |
| Volume (fluids) | litre | L |
| | megalitre | ML |
| | gigalitres | GL |
| | gigalitres per year | GL/y |
| Work and energy | petajoule | PJ |
| | gigajoules | GJ |
| Other abbreviations | carbon dioxide equivalent units | CO2-e |
| | watts per square metre | W/m2 |
| | degrees Celsius | °C |
| | tonnes per hectare per year | t/ha/yr |
