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Why does the size of the cross-sectional area of a mercury barometer not affect the height of the enclose mercury column?
Wiki User
∙ 11y ago
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.
Wiki User
∙ 11y ago
Wiki User
∙ 7y agoPressure = Force/Area so pressure exerted by the column of mercury = weight of mercury/cross sectional area
= (Mass of mercury column*g)/x-sectional area where g is the acceleration due to gravity.
= (Volume of mercury*density)*g/x-sectional area (because mass = volume*density)
= (Height of column*x-sectional area)*density*g/x-sectional area
= Height of column*density*g
That is, the x-sectional area has no effect.
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How do you make a homemade barometer?
Wrap a plastic sheet and seal it air tight to a jar and attach a small rod attach to the centre of the seal and allow it to pivot around the side if the jar could be a simple homemade barometer. Another model of barometer can be made using a sealed can attach to the tube inverted over a basin of water. Some trouble on these type of barometer is the pressurized and depressurised could be affected by the temperature but at the same temperature, the effect of movement will be solely on the atmospheric pressure. An inverted glass tube filled with mercury with vacuum space would be the best since the temperature would minimally affect but that would need large amount of mercury which is not readily accessible for a home experiment.
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How do you make a homemade barometer?
Wrap a plastic sheet and seal it air tight to a jar and attach a small rod attach to the centre of the seal and allow it to pivot around the side if the jar could be a simple homemade barometer. Another model of barometer can be made using a sealed can attach to the tube inverted over a basin of water. Some trouble on these type of barometer is the pressurized and depressurised could be affected by the temperature but at the same temperature, the effect of movement will be solely on the atmospheric pressure. An inverted glass tube filled with mercury with vacuum space would be the best since the temperature would minimally affect but that would need large amount of mercury which is not readily accessible for a home experiment.
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