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What does it mean by the statement pressure of gas is 13.6 cm of Hg?
at sea level mercury barometer reads 13.6cm
Why is mercury used in barometers instead of water?
Because it has a high density... meaning that the volume increase or decrease due to altitude change is can be viewed in a practical sized barometer. If water, which had a much lower density, was used instead of mercury, the barometer must be at least 15m high.
Why is the fluid in a barometer rather than water or another liquid?
Because Mercury is heavier than water, therefore it takes more atmospheric pressure to make the mercury move. However, there are aneroid barometers, which don't have any fluid in them at all.
Why does the size of the cross-sectional area of a mercury barometer not affect the height of the enclose mercury column?
The height of the column in a mercury barometer is determined by pressure, not force. Fluid pressures depend on density and depth-pressure at the bottom of a wide column of mercury is no different than the pressure at the bottom of a narrow column of mercury of the same depth. The weight of fluid per area of contact is the same for each. Likewise with the surrounding air. Therefore barometers made with wide barometer tubes show the same height as barometers with narrow tubes of mercury.
Why is an altimeter important to an airplane pilot?
The altimeter is essentially an aneroid barometer that reads in units of altitude rather than pressure. This is possible by using the standard atmosphere to make the conversion from pressure to altitude.
Why should a barometer be outside?
A barometer should be outside because houses can have different pressures than the outside pressure. If you've ever seen wind blowing out of your window, especially in a large building such as an apartment complex or dormitory, that is an example. Barometers are used to predict weather patterns, so it is more useful to know the general air pressure rather than the specific air pressure of one dwelling.
Why you use mercury manometer to measure atmospheric pressure at sea level rather alcohol?
Mercury has two advantages over alcohol when it comes to measuring pressure in a manometer: 1) it is far denser than alcohol. A column of mercury need only be about 760 mm ( about 3/4 of a meter) high to exert a pressure equal to atmospheric pressure at sea level. Alcohol would have to be over 13 meters high to reach the same pressure! (rather impractical) 2) Mercury has a very low vapor pressure so it doesn't evaporate when exposed to the atmosphere. It also contributes a negligible amount of pressure above the column on the sealed end of the manometer for pretty much any atmospheric temperature. Alcohol has a significant vapor pressure so it would tend to evaporate when exposed to the atmosphere. It also has a high enough vapor pressure that it would contribute a noticeable amount of pressure on the sealed end of the manometer - and the pressure would vary quite noticeably over the range of temperatures that atmospheric manometers are commonly exposed to - so the manometer reading would always have to be corrected for temperature - more so than the mercury manometer must be.
What is the meserment for air pressure?
The SI unit of pressure is the pascal. 1 pascal is rather small, so normal atmospheric pressure on Earth is about 100 kilopascal.However, any pressure units can be used; some that have been are psi (pounds per square inch), bar (defined so that average air pressure = 1 bar), inches (or millimeters) of mercury (the pressure exerted by a column of liquid mercury of that height)or torr (1 torr = 1 mmHg);.
What are mercury barometers?
A barometer measures air pressure. A mercury one does so by taking a tube full of mercury which is inverted into a dish of mercury. The height of mercury remaining in the tube is a measure of the air pressure.
Is Mercury least conductive?
No. Mercury is actually rather conductive, being a metal.
How much is a barometer?
Technically, millimeters of mercury. These days, though, inches of Mercury is much more common. When the weatherman says that the barometer is 29.7, they are referring to the number of inches that the air pressure will force mercury to go up inside a glass tube. These days, they don't use the actual mercury column so much, but rather mechanical barometers.
How do scientists predict weather by using a barometer?
Very simply put, cold air is denser than warm air - thus as air of differing temperature passes over you (or rather your barometer) the barometric pressure will change. The arrival of warm air will cause the barometric pressure to fall and as warm air holds more moisture than cold air a falling barometric pressure will herald the arrival of rain. Conversely, if the pressure rises this will indicate some nice sunny days to come Further, if the pressure falls (or rises) fast, then there are likely to be strong winds.
