100 pascals or 1 millibar. Exceptions include Canada, which uses kilopascals (kPa). In many other fields of science, prefixes that are a power of 1000 are preferred, which theoretically excludes hectopascal from use.

Many countries still use millibars to measure atmospheric pressure. In practically all other fields, the kilopascal is used instead.

Multiples and submultiples

Decimal multiples and submultiples are formed using standard metric prefixes.