When we take measurements for WeatherBlur we use the international measurement system, that all scientists use – that is metric.

- Distances are measured in meters (m)
- Volumes are measured in liters (l)
- Mass is measured in grams (g)
- Temperatures are measured in degrees Celsius. (C)
- Pressure is measured in pascals (Pa)
- Energy is measured in joules (J)
- Time is measured in seconds (s)

Metric is a very simple system to use because it uses base-10 (i.e. all the units are either 10, 100 or 1000 etc) for all its measurements. A unique prefix is given for each order of magnitude:

Kilo- Hecto- Deca- BASE Deci- Centi- Milli-

1000 X 100 X 10 X 1/10 X 1/100 X 1/1000 X

So for example, when we measure distance we use meters. If the measurement is 1000 meters it is called a kilometer. If the measurement is a thousandth of a meter it is called a millimeter. Distances between towns would be measured in kilometers. The thickness of a shell would be measured in millimeters.

The only exception to this is time – which is measures in seconds, hours, days etc.

**In the metric system there are some easy to learn relationships like these:**

1 liter of water weights 1 kilogram.

Water freezes at 0oC

Water boils at 100oC

**If you need to convert US measurements into metric, you can use this external site to do the conversions:**