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Air pressure is measured by what?
Air pressure is typically measured using a barometer. This instrument can be either an aneroid barometer or a mercury barometer. It provides a numerical value that represents the force exerted by air molecules in a specific area.
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.
Does a mercury barometer or aneroid barometer measure air pressure?
mercury has a sudden fall and then the barometter measure it and when i mean by fall i mean air pressure so yeah it's cool I knoe it doesn't make sense but Im just writing this anyway. Even though it's pure glorius silly you know what. I PUT THAT WORD BUT THEY WON'T LET ME POST THIS STUPID ANSWER
When the barometer reading goes upwe have a pressure area?
air pressure
What equals the force of Earth's atmosphere on the mercury in the dish?
The force of Earth's atmosphere on the mercury in the dish is equal to the atmospheric pressure acting on the surface area of the mercury. This can be calculated using the formula ( F = P \times A ), where ( F ) is the force, ( P ) is the atmospheric pressure (approximately 101,325 Pa at sea level), and ( A ) is the surface area of the mercury in the dish. The pressure exerted by the atmosphere pushes down on the mercury, causing it to rise in a connected column, such as in a barometer.
Does the height of the mercury column decrease if the diameter of the tube increases in a barometer?
The height of the mercury column is not affected by the diameter of the tube. Here is the proof: Pressure is force per unit area; P =F/A. Force, F = mass (m) x gravity acceleration (g), and mass = density( d) x volume (V) Therefore, P = (d x V x g) / A. Since volume (V) = Area (A) x height (h), then P = (d x A x h x g) / A, which upon cancelling A from numerator and denominator gives P = d x h x g. This shows that diameter of the tube has no effect on height of mercury inside the barometer tube.
When the moist humid air moves into an area the barometer will be?
The barometer will likely register a drop in air pressure as the moist humid air moves into an area. This drop in pressure is due to the warm moist air being less dense than cool dry air, leading to lower pressure readings on the barometer.
How would you expect the reading on a barometer to change as a storm moves into your area?
Yes. You would expect the pressure to drop. A low pressure system consists of rising warm air that swirl around a center. Because the air is rising, it lowers the air pressure pressed on the ground. Because of this the pressure-sensing barometer will read that the air pressure is lower. Lower pressure means rain because the warm rising air makes clouds. Expect the pressure to drop as a storm is a low pressure system. Note that cyclones/hurricanes have even lower pressure.
How do you find altitude pressure?
Pressure= Force/Area Pressure of a Liquid is density times gravity times height
When barometer is dropping the air pressure is?
decreasing
Describe how a mercury barometer measure air pressure?
The basic principle of barometer is Torricelli's experiment. Imagine that you fill a tube of one metre length (100cm) with mercury up to the brim. Then close the mouth of the tube with your thumb and invert the tube and place it in a cistern of mercury with its end immersed in the mercury say some 4 cm. Now you remove your thumb. Mercury would come down but it stops at one level to our astonishment. This level would be some 20 cm from the closed end of the tube. So there will be almost 76cm column of mercury in the tube. Why is it so? As mercury comes down the space left vacant will not be having any air molecule and so it is almost vacuum. This is named as Torricelli's vacuum. Now the air outside in the atmosphere would exert a pressure and wants to push the mercury towards this vacuum place. But the weight of the mercury column (76cm) will balance this pressure. Hence we say the atmospheric pressure will be 76 cm of mercury. This is how we have mercury scale for measuring the pressure. Usually pressure is defined as the force per unit area. Hence the unit will be N/m2 or pascal. But we give pressure only in cm or mm of mercury. The reason is explained properly. Same technique is applied in Fortin's barometer and vernier arrangement is made to measure the pressure so accurately.
What measures air preasure?
Any pushing force measured per unit area is termed as pressure. So the force may be the weight of a column of liquid or gas. Or the change in momentum of impinging particles per unit time on the plane. This will be equally balanced by the pressure exerted by the column of mercury. Hence the pressure is given in the familiar unit of height of mercury such as 760 mm of mercury(Hg) for normal atmospheric pressure. -------------------------------------- The SI unit for pressure is pascal (N/m2), with the symbol Pa. 1 Pa = 10e-5 bar = 1,0197.10e-5 at; 1 mmHg has 133,322387415 pascals.
