Barometer is an instrument used to measure the atmospheric pressure. The barometer denotes the atmospheric pressure in milibars or hecto-pascals. ( where 1 milibar = 1 hecto – pascal )
Every three hourly reading of the barometer gives the barometric tendency , and by the continuous observation of the barometric tendency a mariner can make out or predict the up coming weather in the surrounding areas on nearby areas in which he has to navigate his ship.
There may be two types of changes in barometric tendency / pressure.
- decreasing pressure ( LOW PRESSURE )
- increasing pressure ( HIGH PRESSURE )
