bar

1

Convert to and from bars to other major units of pressure

A unit of pressure, = 10⁶ dynes per square centimeter = 10⁵ pascals. The bar is not an SI unit, but continued use, temporarily, of the millibar in meteorology has been sanctioned. The microbar (1 dyne per square centimeter) is often used in calibrating microphones and loudspeakers.

Symbol, bar. In SI, the symbol for the millibar is mbar, but the symbol mb is usually used in meteorology.

According to the current national standard in the United States¹, the bar is not to be used. Kilopascals should be used instead. (1 millibar = 1 hectopascal.)

1. IEEE/ASTM SI 10™-2002.
American National Standard for Use of the International System of Units (SI): The Modern Metric System.
New York: IEEE, 30 December 2002.

See Section 3.3.3.

2

Convert to and from dynes per sq. centimeter to other major units of pressure

In the centimeter-gram-second absolute system of units, the unit of pressure = 1 dyne per square centimeter.

3

In France, a term for 1,000 kilograms, used in the early days of the metric system. By the mid-19th century, it had been replaced by millier and tonneau in France.¹ Currently tonneau refers to a cask smaller than a tonne.

1. Doursther, page 45.

2. Latimer Clark.
A Dictionary of Metric and Other Useful Measures.
London: E & F.N. Spon, 1891.