Why does the height of mercury in a barometer decreases on going up on high mountain?

As the atmospheric pressure rises or falls so the mercury level in the tube rises or falls. If the atmospheric pressure drops it will not be able to hold up so much mercury and so the level in the barometer tube will fall. Up a mountain the air pressure is low and so the barometer reading will go down.

Why the height of mercury in a barometer is independent of the cross sectional area of the tube?

since A is cancelled out, the height of the mercury level is independent of the cross-sectional area. If the tubing were tilted at an angle of 15∘, the vertical height of the liquid would be the same so it would still work.

Why doesn’t the size of the tube in a mercury barometer affect the height of the enclosed mercury column?

Why doesn’t the size of a cross sectional area of mercury barometer affect the height of the enclosed mercury column? The height of the column in a mercury barometer is determined by pressure, not force. The height would be less.

Why does the height of the mercury column not remain constant at 760 mm Hg?

At sea level, a mercury column will rise a distance of 760 mm. This atmospheric pressure is reported as 760 mmHg (millimeters of mercury). At higher altitudes, the atmospheric pressure is decreased and so the column of mercury will not rise as high.

What will happen if the height of the mercury level increases gradually?

Gradual rise in mercury level is equal to good weather conditions or sunny days. Thus, no possibility of rain. Note:Remember that the glass tube is immersed in the mercury the air pressure in the atmosphere presses the surface of the mercury.

When the height of the mercury column suddenly falls indicates?

The mercury column in the barometer fall rapidly before a severe storm, It is due to Fall in the atmospheric pressure. In general, a falling barometer indicates the approach of a storm. If the mercury is over 30.20 inches but falling quickly, warmer, cloudier weather is coming.

How is barometric height affected if the barometer tube is not of uniform bore?

Answer: This is neglecting the effect of surface tension which, in any case will be negligible with the tube diameters generally used in barometers. The height of the mercury column in the barometer above the level of mercury in the bowl will remain same irrespective of how deep in the bowl the glass tube is pushed.

What keep the mercury in the tube?

The mercury is in a long glass tube with an open reservoir at the bottom: higher atmospheric pressure exerts a downward force on the mercury in the reservoir – and pushes the mercury up the tube.

Which one of the following does not cause the height of mercury column to vary?

Evaporation of mercury will not make any change in this mercury column, since the column is enclosed by a glass tube. So not only air but also mercury can’t escape from the system. Thus, it won’t make any change in the height of mercury. So, the correct option is C.

What is the height of mercury column in a simple barometer at the sea level?

At sea level and at a temperature of 0° Celsius (C), the height of the mercury column is approximately 30 inches, or 76 centimeters. This represents a pressure of approximately 14.7 psia. The 30-inch column is used as a reference standard.

How will the barometric height be affected if mercury was replaced by water in simple barometer?

Answer: . The column of water inside the barometer would be 13,6 times higher, since the density of mercury is 13,6 times that of water.

How is the barometric height of a simple barometer affected if the barometer moved inside mine?

If the tube of a simple barometer is pushed down into the trough of mercury then the atmospheric force exerted on the tank will be adjusted by the mercury until the weight of the mercury column gets balanced. Hence the barometric height of a simple barometer remains unaffected.