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Can you briefly explain Torricelli's Experiment between mercury and atmospheric pressure?
Torricelli's experiment: Spring 1644, Florence (Italy): Venue of a famous experiment: Torricelli did his experiment with quicksilver or mercury. He proved two things with this experiment: 1, Nature doesn't abhor the void (nature doesn't fear vacuum) 2, and that the air has weight: He used a glass barometric tube of about 1 m in length which was open at one end and closed at the other end. He also used a glass funnel, which was used to pour in mercury. He put the glass funnel inside the one end open glass barometric tube of 1m and poured mercury into it. He used this method to avoid the formation of any air bubbles inside or in other words, it was not to create any void inside the tube. He removed the glass funnel after pouring the mercury, and then closed one end of the barometric tube with his finger, inverted it to make the open end at the bottom and the tube was inserted into a vessel containing mercury carefully without forming any air bubbles. He found that the mercury in the 100cm tube dropped to 76cm. He did the same experiment with water. But that required a long tube. Water has a density 136 times less than that of mercury, and this experiment returned the water column at a height of 103m. This means that the height of the water column = the height of the mercury column (76cm) X relative density of water with respect to mercury (136).
Is it dangerous to break fluorescent light bulbs on your back if you drain the mercury?
Yes, and not just because of the glass it is made of. The bulbs have mercury inside of them which can make you ill.
What prevents mercury in the tube of a barometer from running out into the container at the bottom of the tube?
The top of a barometric tube is sealed leaving no place for air to escape. It works along the same principle as a drinking straw, but in reverse. In a drinking straw, the sucking motion reduces the pressure of the air inside the straw to a lower level than the air outside the straw. Liquid resists changes in volume due to pressure and is drawn up through the tube due to the air pressure exerted on the surface of the liquid outside the straw. In a barometric tube the tube is sealed at one end, trapping a finite amount of gas in the tube. The air pressure inside and outside the tube is equal, keeping the mercury suspended at a certain level. If the pressure outside is raised, more force is exerted on the surface of the mercury outside the tube than on the surface inside. This raises the level of the mercury in the tube until the pressure of the air is equalized -- there is still just as much air in the tube, but a smaller volume at a greater pressure.
What is the measurement of theormeter?
A thermometer is used to measure temperature by the movement of a substance called mercury inside a sealed tube
Can you hold Mercury in your hand?
Yes. It is a heavy metal and will lead to mercury poisoning over time as it is a cumulative exposure.it breaks in your hand.no poisoning is done if it dosent do inside your body . but if it goes may lead to cancer
What does a barometer has in it?
barometer has mercury inside it .
If to r r i c e l li had drilled a little hole at the top of the glass tube holding his Mercury column what would have happened to his barometer?
If Torricelli had drilled a hole at the top of the glass tube holding his mercury column, air would enter the tube, causing the mercury to drop. This is because the atmospheric pressure, which supports the mercury column, would be equalized with the pressure inside the tube. As a result, the barometer would no longer function properly, as it relies on the vacuum at the top of the column to maintain the height of the mercury.
What accounts for the difference in heights of mercury vs water columns?
Density
What liquid metal is found inside of a barometer?
Mercury.
What pushes mercury up a tube in a mercury barometer?
the air off of Mercury has a big tube in the inside of it and it pushes in up
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.
How a barometer can be used to measure the vapor pressure of a liquid?
A mercury thermometer, that is a barometer can be used to measure vapor pressure. Initially, a proper temperature must be recorded. Then the liquid should be injected into the mercury column. This new measurement subtracted from the original will yield the vapor pressure of a liquid.
What pushes Mercury up in a tube of a Mercury barometer?
That depends on the 'tube' involved. In a thermometer the mercury expands and contracts within a sealed tube as the temperature is raised or lowered. In a barometer there is a reservoir of mercury which the atmosphere presses on. This maintains the mercury in a column which is sealed at the top. Increases in atmospheric pressure push the mercury further up the tube, decreases let it drop down the tube.
Why is Mercury used in barometers?
In the mercury barometer, atmospheric pressure balances a column of mercury, the height of which can be precisely measured. Other liquids can be used in barometers, but mercury is the most common because of its great density.Mainly due to its high density
How does a barometer work?
There are a couple of types. By far the most common is the aneroid barometer. The heart of an aneroid barometer is a sealed can. As the surrounding pressure rises and falls, the can shrinks and expands. A mechanical linkage translates the deflection into the movement of a dial. It could also be measured with a strain gauge, with the resistance translated into pressure.The Mercury barometer has a tube sealed at the top, full of mercury sitting in a cup full of mercury. A vacuum forms at the top because the exterior pressure can only support a column equal to the height times the density of mercury.Air pressure pushes on the mercury inside of the container, the mercury moves up the glass tube. The greater the air pressure the higher the mercury will rise.
Why is the value of atmospheric pressure compared to mercury?
The common method to measure atmospheric pressure employs an inverted column submerged in a fluid to determine the level at which the column has to be raised to equalize the external atmospheric pressure and the internal column pressure. The height at which the fluid inside the column ceases to increase is correlated to atmospheric pressure. Due to mercury's high density, this level is on the order of inches (~30 inches of mercury at atmospheric pressure). If water were to be used the column would have to be ~32 feet tall in order to develop the equalized pressures between the column and atmosphere.
What is at the top of the barometer?
At the top of a barometer is typically a sealed chamber containing a vacuum or a reference pressure. This chamber allows the barometer to measure changes in atmospheric pressure by comparing the pressure inside the device to the external air pressure.
