0
What supports the column of mercury inside the glass tube of a barometer?
Wiki User
∙ 13y ago
Another tube. Or in a solid manomometerof any type, a hollowed out, encapsulated space.
Wiki User
∙ 13y ago
Add your answer:
Earn +20 pts
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
Do a Clinical thermometer needs a magnet?
No, a clinical thermometer does not need a magnet. You may be thinking of a Maximum/Minimum Thermometer which has a U-tube containing mercury which expands and contracts as the temperature changes. Each arm of the U-tube contains mercury upon the upper surface of which are tiny floats made of steel (which floats on mercury) with tiny springs on their sides so that they grip the tube inside when the mercury does not move them any more. One of the floats records the highest temperature to which it was pushed, and the other indicates the coldest temperature to which it was pushed. So you are able to find out what the actual maximum and minimum temperatures were during the past 24 hours. So why do we need a magnet? It's purpose is to attract the steel floats back to their positions just sitting on top of each mercury column.
What does a barometer has in it?
barometer has mercury inside it .
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
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.
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.
How can you determine air pressure?
Air pressure is usually measured using a barometer. This device usually has mercury inside it along a tube that is a compete vacuum. As the air pressure rises the pressure of the air pushes down on the mercury and forces it to rise further into the vacuum. 760 mm of mercury is considered to be 1 atmosphere. For very high pressures an aneroid barometer is used. This has wafers inside that are compressed under high pressure that give a reading.
What is an instrument that measures changes in air pressure using liquid mercury?
Any liquid can actually be use in a tube (barometer) to measure air pressure, but there are various advantages in using mercury for the purpose. 1. Mercury is a shiny liquid (a liquid metal) so it can be easily seen through the glass tube. Other liquid like water are transparent. 2. Mercury is very heavy. So only 76cms of it rises in the tube. Had you been using water for the purpose, you would need a glass tube as long as 55ft. 3. Mercury does not stick to the glass surface inside, so the reading obtained is much more accurate and precise. Remember: Water droplets stick to glass.
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.
Does it matter if you hang a barometer on a inside wall or outside wall?
No. The only thing that would matter is if the barometer were inside a pressure-sealed room.
Where is the hazard switch in a 1998 Mercury Grand Marquis?
The button for the hazard lights is on top of the steering wheel column , the switch is part of the multi-function switch inside the steering column cover
Where is the electronic ignition switch located on a 99 Mercury Cougar?
Inside the steering column behind (connected too) the ignition key switch
