Argh this is driving me insain lol, i cant find the meaning of it anywhere!! What does it mean, what is it?
2007-02-02 16:31:32 · 2 answers · asked by Christie M 1 in Science & Mathematics ➔ Weather
You are spelling it wrong, that is why you can't find info. See below for a link. I hope this helps.
Hectapascal - Has taken over from the millibar as a unit used to express atmospheric pressure. Fortunately 1 millibar is equal to 1 hectapascal.
2007-02-02 16:37:59 · answer #1 · answered by Anonymous · 1⤊ 0⤋
The term is hectoPascal and the abbreviation is hPa. Measurement of air pressure began by measuring the height of the column of mercury in a barometer with the height given as inches of mercury or centimetres of mercury.
"Inches of mercury" is not really a measurement of pressure and cannot be used in any calculation so a unit of pressure was used. There are two metric systems, the centimetre/gram system and the metre/kilogram system. Each has different units. The "Bar" is a unit of pressure in the centimetre/gram system and the unit chosen to measure air pressure was the millibar. One Bar is 1000mb.
Internationally, the metre /kilogram system was adopted as the world standard and the unit of pressure in that system is the Pascal. To avoid having to change every barometer and altimeter in the world, the unit chosen for air pressure was the hectoPascal because 1hPa = 1mb.
2007-02-03 16:39:34 · answer #2 · answered by tentofield 7 · 0⤊ 0⤋