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When the height of the mercury in a barometer is 29.92 inches the barometric pressure is?
Wiki User
∙ 9y ago
The standard sea level pressure of Earth's atmosphere - a pressure of 1 Bar or one "atmosphere".
Wiki User
∙ 9y ago
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What does a decrease in the height of the mercury column usually indicate on a barometer?
low pressure system and stormy weather
Why does the height of the liquid column in a barometer changes as atmospheric pressure changes?
Pressure tendancies measure short term weather. The mercury in a barometer will rise with atmospheric pressure denoting fairer weather and a fall in barometric pressure warns of inclement weather.
An altimeter is an adaptation of the?
The altimeter is basically a specialized pressure gauge. It measures the pressure of the column of air above it. As the altitude varies, the air column height varies, which registers on the altimeter. Since the air pressure also varies with changes in the barometric pressure, altimeters must have an adjustment to compensate for changes in local barometric pressure.
What does it mean when the barometric pressure is at 29.49 inches?
When the barometric pressure is 29.49 inches of mercury it means the pressure is slightly less than that at sea level. Sea level atmospheric pressure is regarded as 1 atmosphere (= 760 mmHg = 29.92 in Hg = 14.7 lb/in2 = 101.3 KPa) Pressure lowers (the inches of mercury falls) as one's elevation above sea level increases or as low pressure fronts associated with warmer or wetter weather systems move into an area. The indicated 1/2 inch difference would inicate being on a slight height of land, or that there was a low pressure zone (damp weather perhaps) in the area. More significant for weather is the rate of change of the barometric pressure.
What are the difference between the mercury barometer and aneroid barometer?
A mercury barometer works by, measuring the height of a column of mercury in a sealed tube, supported by the atmospheric pressure.An aneroid barometer measures the amount of distortion of a sealed metal can, due to changes in atmospheric pressure. The equivalent column of mercury supported by a mercury barometer, can then be calibrated in mmHg by comparison.Both instruments do the same job and can be calibrated in Millibars or mmHg, or both.
A decrease in the height of a column in a mercury barometer means that .'s surface?
When air pressure increases, the mercury in a barometer rises.
In a mercury barometer what is the height of the mercury for average air pressure?
2.5 feet or 760 milimeters
What does a decrease in the height of the mercury column usually indicate on a barometer?
low pressure system and stormy weather
What does a decrease in the height of a column in a mercury barometer mean?
air pressure is decreasing
As air pressure increases does the height of a column of mercury in a barometer increase?
yes it increases
Why does the height of the liquid column in a barometer changes as atmospheric pressure changes?
Pressure tendancies measure short term weather. The mercury in a barometer will rise with atmospheric pressure denoting fairer weather and a fall in barometric pressure warns of inclement weather.
What would happen to a mercury barometer when the air pressure is getting lower?
The height of the column of mercury would be lower.
An altimeter is an adaptation of the?
The altimeter is basically a specialized pressure gauge. It measures the pressure of the column of air above it. As the altitude varies, the air column height varies, which registers on the altimeter. Since the air pressure also varies with changes in the barometric pressure, altimeters must have an adjustment to compensate for changes in local barometric pressure.
When air pressure increases the liquid in a mercury barometer would what?
The height of the Mercury column would decrease.
Why must a barometer be place where are no temperature extremes?
The height of the mercury column is used to measure atmospheric pressure. If the barometer is also subjected to high temperatures, the thermal expansion of the mercury column will indicate a higher pressure than is really the case. This will make the barometer readings useless.
If a meteorologist says that the air pressure is getting lower what would you expect to happen to a Torricelli's mercury barometer?
The height of the Mercury column would decrease.
If a meteorologist says that the air pressure is getting lower what would you expect to happen to Torricelli's mercury barometer?
The height of the Mercury column would decrease.
