How does the weight of mercury in a barometer tube compare with the weight of an equal cross-section of air from sea level to the top of the atmosphere?
"The barometer 'balances' when the weight of the liquid in the tube exerts the same pressure as the atmosphere outside." How does the weight of mercury in a barometer compare with the weight of an equal cross-section of air from sea level to the top of the atmosphere? They are equal.
What causes atmospheric pressure quizlet?
What causes atmospheric pressure? Atmospheric pressure is caused by the weight of air, just as water pressure is caused by the weight of water.
Why are high altitude research balloons only partially inflated when launched quizlet?
Why are high-altitude research balloons only partially inflated when launched? The atmospheric pressure decreases as they rise, so they expand. If they were fully inflated at launch, they would burst at high altitudes.
What happens to the internal pressure in a fluid flowing in a horizontal pipe when its speed decreases?
What happens to the internal pressure in a fluid flowing in a horizontal pipe when its speed decreases? The pressure increases when the speed decreases.
What happens to the mercury in a barometer when the atmospheric pressure increases?
As atmospheric pressure increases, the mercury is forced from the reservoir by the increasing air pressure and the column of mercury rises; when the atmospheric pressure decreases, the mercury flows back into the reservoir and the column of mercury is lowered.
What happens to the mercury in a barometer when the atmospheric pressure decreases?
Solution : The weight of the column of mercury in the barometer is exactly balanced by the atmospheric pressure. Therefore, a decrease in the atmospheric pressure decreases the level of mercury to such an extent that the weight of the column of mercury is again equal to the changed atmospheric pressure.
What causes atmospheric pressure?
Air pressure is caused by the weight of the air molecules above. Even tiny air molecules have some weight, and the huge numbers of air molecules that make up the layers of our atmosphere collectively have a great deal of weight, which presses down on whatever is below.
How and why are friction layer surface winds different from upper atmosphere geostrophic winds?
How and why are friction layer (surface) winds different from upper-atmosphere geostrophic winds? Geostrophic winds flow parallel to the isobars. Friction layer winds cross the isobars at angles between 0 and 90 degrees. In the upper atmosphere gas molecules do not come into contacts as frequent.
What can be said about the pressure of an inflated balloon quizlet?
The gas pressure inside an inflated rubber balloon is always greater than the air pressure outside. Explain. The stretched rubber of an inflated balloon provides an inward pressure. So the pressure inside is balanced by the sum of two pressures; the outside air pressure plus the pressure of the stretched balloon.
What happens to the air pressure inside a balloon when the balloon is squeezed to half its volume at constant temperature?
At a constant temperature, the air pressure will double inside a balloon when it is squeezed to half its volume.
What happen to the internal pressure in a fluid flowing in a horizontal pipe when its speed increase?
The internal pressure decreases in a fluid flowing through a horizontal pipe when its speed increases.
When the mass of a fluid increases what happens to the pressure it exerts on objects?
When the mass of a fluid increases, what happens to the pressure it exerts on objects? The pressure it exerts on objects increases.
Why the mercury in barometer or thermometer can go up when the temperature and the air pressure increases?
Air pressure pushes down on the surface of the mercury, making some rise up the tube. The greater the air pressure, the higher the mercury rises.
When a barometer measures a drop in atmospheric pressure what type of weather is usually going to happen?
In general, a falling barometer means worsening weather. When atmospheric pressure drops suddenly, this usually indicates that a storm is on its way. When atmospheric pressure remains steady, there will likely be no immediate change in the weather.
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 happens when air pressure increases?
For example, if air pressure increases, the temperature must increase. If air pressure decreases, the temperature decreases. It also explains why air gets colder at higher altitudes, where pressure is lower.
What causes air pressure to increase or decrease?
Air Pressure Basics It increases as air density increases and lowers as air density lowers. It increases as temperatures increase and lowers as temperatures cool. It increases at lower altitudes and decreases at higher altitudes. Air moves from high pressure to low pressure.
Why is geostrophic wind flow around a high pressure Centre clockwise in the Northern Hemisphere?
The centripetal force points towards regions of higher pressure. When the pressure gradient force exceeds the Coriolis force, the air curves counterclockwise in the Northern Hemisphere (clockwise in the Southern Hemisphere).
How does the direction of the wind changes when friction is present what is the effect of surface friction on wind speed and direction?
Near the surface, friction reduces the wind speed, which reduces the Coriolis force. The weaker Coriolis force no longer balances the pressure gradient force and so the wind blows across the isobars toward lower pressure. Thus the pressure gradient force is balanced by friction and Coriolis force.
What happens to the air pressure inside a balloon when the balloon is squeezed?
At a constant temperature, the air pressure will double inside a balloon when it is squeezed to half its volume.
Why is the gas pressure inside an inflated rubber balloon always greater than the air pressure outside?
The gas pressure inside an inflated rubber balloon is always greater than the air pressure outside because the pressure inside balances the atmospheric pressure as well as the pressure resulting from the walls of the balloon.
What do you think happened to the gas particles inside the balloon when you pressed it how would you compare it to the balloon which was not pressed?
By squeezing the balloon, you reduce the space the gas particles can occupy. As the particles are pushed a bit closer together, they collide with more, so the pressure from the moving gas particles increases. Boyle's Law explains the relationship between volume and pressure.
What happens to the pressure when you inflate a balloon?
When you inflate a balloon, you're actually putting gases, in this case mostly helium, into an elastic container. As you add more gas, the pressure inside the balloon increases, and in response, the balloon expands… up to a point, that is!
What happens to the internal pressure in a fluid flowing?
The internal pressure decreases in a fluid flowing through a horizontal pipe when its speed increases.
When the speed of a fluid increases internal pressure in the fluid?
according to Bernoulli's principle, when the speed of a fluid increases, internal pressure of the fluid decreases. This is a consequence of the conservation of energy.
What does Bernoulli’s principle state about fluids?
In fluid dynamics, Bernoulli's principle states that an increase in the speed of a fluid occurs simultaneously with a decrease in pressure or a decrease in the fluid's potential energy.
Does pressure increase as flow increases?
Bernoulli's Principle states that as the speed of a moving fluid increases, the pressure within the fluid decreases. The Bernoulli's Principle explains the behavior of an ideal fluid passing through a pipe or enclosed passageway such a pump.
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.
What is low and high barometric pressure?
What is high or low barometric pressure? Adjusted to sea level, a pressure reading above 30.2 inHg is considered to be high pressure, and below 29.8 inHg is considered low.
What is a barometer used for in weather?
Barometers measure this pressure. Atmospheric pressure is an indicator of weather. Changes in the atmosphere, including changes in air pressure, affect the weather. Meteorologists use barometers to predict short-term changes in the weather.