it means it is going to rain
When air pressure increases, the mercury in a barometer rises.
Maybe you mean what does a mercury barometer measure. In which case the answer is atmospheric pressure.
A mercury barometer is an instrument which can be used to forecast the weather. The fact that there is a barometer does not affect the weather. You need to see what the barometer shows and interpret it.
The precipitation does NOT cause the rise or fall in the barometer. However precipitation is more usually associated with an atmospheric depression (a cyclone) and thus a fall in the barometer will usually FORETELL precipitation.
No, a barometer measures air pressure, not temperature. A falling barometer generally signifies unsettled or stormy weather coming in.
When air pressure increases, the mercury in a barometer rises.
rises
barometers with mercury measure air pressure. when the air pressure is high the mercury rises
Maybe you mean what does a mercury barometer measure. In which case the answer is atmospheric pressure.
A mercury barometer is an instrument which can be used to forecast the weather. The fact that there is a barometer does not affect the weather. You need to see what the barometer shows and interpret it.
The mercury rises. The lower atmospheric pressure allows the mercury to drop in level.
The precipitation does NOT cause the rise or fall in the barometer. However precipitation is more usually associated with an atmospheric depression (a cyclone) and thus a fall in the barometer will usually FORETELL precipitation.
No, a barometer measures air pressure, not temperature. A falling barometer generally signifies unsettled or stormy weather coming in.
Do you mean the old barometer?
Well, an aneroid barometer, is called an aneroid barometer- but, a barometer measures air pressure, and an aneroid barometer is a barometer that contains no liquid.
In case of an aneroid barometer with a spiral, there is an adjusting screw on the back. This screw can loosen or increase tension of the spiral.First you need to know the atmospheric pressure in your area, which can be found on meteorological sites. For example: 1005 mbar(hPa):change. This equals a rating of 753.8mm. There is an easy conversion method between the two, hPa/1.333= mm AND mm *1.333= hPa.(simplified but still very accurate)Thenjust adjust the screw to the right atmospheric pressure on the scale of the barometer, the arrow will be calibrated. (in fact you set the pressure of the vacuum inside the barometer.)Now every change in pressure will be pointed out by the arrow correctly.
That is how you attach an arrow to the bow.