Why would a water barometer have to be 13.6 times taller than a mercury barometer quizlet?
Why would a water barometer have to be 13.6 times taller than a mercury barometer? Mercury is 13.6 times denser than water. A water barometer would need to be 10.3 m high- not practical.
What height would a water barometer needs so that it can be used to measure the standard atmospheric pressure?
Since normal atmospheric pressure is about 105 N/m2 (or 105 Pascals), you would need a mercury column of 0.76 meters (or 760 mm—a common unit for pressure). Using water would require a column 10 meters tall.
Why does mercury make a better barometer than water?
Mercury is commonly used in barometers because its high density means the height of the column can be a reasonable size to measure atmospheric pressure. A barometer using water, for instance, would need to be 13.6 times taller than a mercury barometer to obtain the same pressure difference.
How tall would a barometer made with water need to be?
"How high would a water atmosphere be? Mercury is 13.5 times as dense as water so the water atmosphere would have to be 13.5 x 76 cm, about 10 m."
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.
When atmospheric pressure is increasing the height of the mercury in the vacuum tube of a mercury barometer will be decreasing?
When air pressure increases the mercury in a barometer? The height of the mercury column is about 76 cm (30 in) tall. As the pressure increases it forces mercury higher up into the tube. When the air pressure falls the level in the tube falls as well.
Why mercury barometer is measuring an absolute pressure whereas the height of mercury in its tube represent atmospheric pressure?
A mercury barometer is shown in Figure 4. This device measures atmospheric pressure, rather than gauge pressure, because there is a nearly pure vacuum above the mercury in the tube.
How does A barometer measure height?
Measuring a Building's Height With a Barometer
- Measure the height of the barometer and then stand it next to the building when the sun is about 45 degrees in the sky. …
- Drop the barometer off the top of the building, measure how long it takes to hit the ground, and use this value to calculate the height of the building.
Why water Cannot be used instead of mercury in a barometer?
1. Water cannot be used as a barometric liquid because its density is lower than Mercury. Water's density is 1000 grams per cubic meter. hence it requires a barometer whose height is around 11 meters.
Could we use water instead of mercury to make a barometer?
Water could be used, but the barometer would have to be much larger than one using mercury because of the much smaller density of water. The water column would move greater distances for small changes in pressure, however, thus yielding a more sensitive measurement.
Why is there A big difference between heights of water and mercury column that can be supported by atmospheric pressure?
There is a height difference due to the different densities. The height of mercury lower due to its high density compared to that of water.
Why is water not used in A barometer?
The density of water is greater than all other liquids. The density of water is low. The vapor pressure of water is negligible.
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.
Why the height of mercury in a barometer is independent of the cross sectional area of the tube?
The force required to raise the mercury level to a height of h is equal to the weight of the mercury. Since A is cancelled out, the height of the mercury level is independent of the cross-sectional area.
Why does the height of mercury in a barometer decrease on going up on high mountain?
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.
How does high air pressure affect a mercury barometer?
Simply put, a barometer acts like a balance that 'balances' the weight of the atmosphere (or air around you) against the weight of a mercury column. If the air pressure is high, the mercury will rise. At low air pressure, the mercury goes down.
Why can’t you use water instead of mercury in a barometer?
Mercury is the heaviest liquid. Therefore, it rises only to a height of 76cm to balance the atmospheric pressure. Water, being 13. 6 times lighter than mercury, will rise to a 13.
Why is it that an aneroid barometer is able to measure altitude as well as atmospheric pressure?
A nonliquid barometer called the aneroid barometer is widely used in portable instruments and in aircraft altimeters because of its smaller size and convenience. It contains a flexible-walled evacuated capsule, the wall of which deflects with changes in atmospheric pressure.
What does barometer set height mean?
Altimeter setting is the value of the atmospheric pressure used to adjust the sub-scale of a pressure altimeter so that it indicates the height of an aircraft above a known reference surface.
What is the average height of mercury in A barometer at sea level?
Solution : The height of the mercury column near the sea level is 76 cm.
Why is a water barometer impractical?
Water is not a suitable barometric liquid because: (i) The density of water is low (103 kg m-3). Water barometer will support 10.4m of water at sea level. It is impractical to have such a long tube.
What is the reason that the weight of the object is less in water than in air?
However, since air is less dense than water, the bouyant force of air is less than that of water, so the object in air seems heavier.
What will be height of water column in a barometer tube if water is used instead of mercury?
The pressure of the water column should be the same as that of 76 cm of the mercury.
What would be the height of a barometer column for one standard atmosphere if water were used instead of mercury?
If a barometer carries water instead of mercury, then the height of the column for a pressure equivalent to 75 cm of mercury would be- The correct answer is 1020 cm. Therefore, Mercury is denser than water by means of 13.6 times dense.
How is the barometric height of a simple barometer affected if?
Answer: (a) If the tube is pushed down into the trough of mercury, the barometric height is unchanged. (b) If the tube is slightly tilted from vertical, the barometric height is unchanged. (c) If a drop of liquid is inserted inside the tube, the barometric height decreases.
Why does atmospheric pressure vary with height?
Air pressure is higher at lower altitudes. Air density is higher at lower altitudes. There is more space between air molecules at higher altitudes. There is less oxygen to breathe at the top of a high mountain than there is at sea level.
How is barometric height altered if a drop of water is introduced in a mercury barometer tube?
Solution : the barometer height will decrease if a drop of water is introduced in a mercury barometer, which is due to the pressure exerted by water vapour.
Why does the level of mercury in a barometer change when atmospheric pressure increases?
Since the number of air molecules above the surface increases, there are more molecules to exert a force on that surface. With an increased weight of air above the reservoir, the mercury level rises to a higher level.
What is the effect on the vertical height of the mercury column in a barometer of pushing the tube further into the bowl?
The vertical height of the mercury column in a barometer remains unaffected even if the tube is tilted.
Why does mercury rise in barometer?
Since the number of air molecules above the surface increases, there are more molecules to exert a force on that surface. With an increased weight of air above the reservoir, the mercury level rises to a higher level.