what  is a vaccum flask?
396279
Its a balloon of glass, shaped (usually) to be like a bottle. But unlike a balloon, the volume inside the glass has had all the air extracted before it was sealed (thus forming an airless environment known as a vacuum). \n\nIf there is no air in the space between the layers of glass there are no molecules present. Molecules are required to transfer heat. So if you put your hot soup in a vacuum flask it stays hot for a long time because the heat cannot escape. If you fill it with cold beer, the beer stays cold because the warmer air outside can't get in.\n\nSimple but effective.
171528
What flasks are we talking about here?\nAre there choices to choose from that you did not post?\n\nTemperature is a measure of the average kinetic energy of the particles, the higher the Average KE, the higher the temperature.  Perhaps that will help you.
377342
compressor: compresses things\nevaporator: evaporates things\ncondensor: condenses things\nmetering device: meters things\n\ngood luck
56798
A thermos bottle is made up of 2 layers of material. In between the layers is a vacuum (no air). Since heat cannot be conducted through a vacuum, the liquid inside the thermos stays warm.
194678
For the vacuum cleaner, see:\nhttp://en.wikipedia.org/wiki/Vacuum_cleaner#History\n\nFor the microwave oven, see:\nhttp://en.wikipedia.org/wiki/Microwave_oven#History
756504
An apparatus for reflux uses a round bottom flask for boiling the reaction contents and allowing the vapours to condense in a water cooled condenser attached vertically above the flask.  The vapours condense and run back down into the flask in order for them to boil again.\n\nIt is a method for boiling a solvent, or mixture, under conditions of near constant volume without the need to "top up" the vessel with fresh solvent.
826679
Let's assume that the flask is upside down in a water bath.\nAt 100 C, it contains some water (volume = x), and a volume of hot gas (VH).  When cooled to 0 C, the volume of the gas decreases, and some water (214 mL) is pulled into the flask. The volume of the cool gas is now VC. \n\nSome relationships to get you started:\n\nVH - x = 300 mL\nVH - VC = 214 mL\n\nCharles' Law\n\nVC / TC  =   VH / TH\n\nor\n\nTH /TC    =    VH / VC
325055
The atmosphere has a pressure of about 14 pounds per square inch. The suction cup forms the top of a small enclosed volume, where the surface it is sticking to forms the bottom. If you can keep all the air out of that little volume then it is a vacuum and the pressure inside is zero pounds per square inch. In that case, a 1 square inch suction cup is PUSHED against the surface by a force of 14 pounds. The spit is just to help seal the edges to keep air from leaking in to the vacuum.
993636
As with any system you must first define what are you trying to trap, liquids or gases, this will determine the temperature that you must cool the gas in the system to liquify the gas.\nSomewhere in the system, before you hit the vacuum pump, you have to set a condenser or vacuum trap. The condenser or vacuum trap will be filled with a liquid coolant to lower the temperature of the gas in order to liquify it and precipitate it.\nIn test laboratories they use liquid nitrogen as a coolant and this will trap ethane and methane molecules and liquify them, then you can drain them through a valve.
818699
Probably  a storage tank for alcohol in a distillary.
320335
vacuum\ni used spell check it says so
380924
A perfect vacuum (on earth) equals (-)14.7 psig.  You can not produce a stronger vacuum.  For example, when you press a suction cup against glass, you must pull with a force of 14.7 pounds for every multiple or fractional square inch of effective surface of the suction cup.  If it has an area of one square inch you must pull with 14.7 pounds of force, against the pressure of the atmosphere, to pull it free.  At the bottom of a swimming pool you would have to pull that much plus the weight of a column of water one square inch in cross-section times the depth.\n\nFor your vacuum cleaner you can easily determine its suction "power" by using it to suck water up a long clear plastic tube.  A perfect vacuum would suck up a water column about 34 feet high (depending on barometric pressure) but a typical vacuum cleaner would likely produce a column about six feet tall.  If you measure the column in "inches of water" you will have your vacuum rating, e.g., 72-inch w.c. (water column) and can use the procedure to rate various vacuum cleaners.  Caution: the tube must be tall enough to avoid sucking water into the vacuum cleaner (and shorting it out?) and let the water out with the vacuum off (if the tube is on the ground the water will suck right into the vacuum cleaner!).  Also do not run the vacuum cleaner too long without air flow which cools the motor or you will burn out the motor.  Good luck.
670103
Assuming that NO2 is an ideal gas is these conditions (which is a reasonable assumption at such a low P), the number of moles into that flask is: n = PV/(RT) where P = 432 mmHg = 0.568 atm, V = 0.5 L, T = 60 C = 333 K, R = 0.082 L atm/(mol K).\nThen: n = 0.01 mol and, taking into account the Avogadro Number (in number of particles/mol) the number of molecules is NM = 0.01*6.022x10^23 = 6.022x10^21.
797201
Please be more specific about what you are asking.  I'm guessing this is a chemistry question, and you're talking about a flask placed in a Moissan electric furnace?  If so, it simply serves as a heating vessel to contain whatever substance you are experimenting with.
891142
I think it would be cool if there were a mini vacuum-cleaner that was about as big as two or three fingers. Then you could clean up messes anywhere without being obvious about it. Plus it would recycle the dust and dirt and lint or messy stuff and turn it into long hard stakes that would work to hold up tents when you go camping. So basically it would have 2 functions. Maybe, because it sweeps up stuff and turns it into stakes, you could call it the "Sweepstakes Vacuum  Cleaner." Ha ha.
92415
The Volumetric flask is used to measure one specific volume. Mostly a single flask can only be used for a certain measurement, e.g. a 250.00mL flask can only be used to measure 250mL.\n\nThe pipet is used totransport small quantity of liquid. They are usually made of plastic and are disposable.
1038092
A separating funnel or separation funnel or separatory funnel is a piece of laboratory glassware used to partition the components of a mixture between two immiscible liquids of different densities.\n\nTypically, one of the liquids will be water, and the other an organic solvent such as ether or chloroform. The funnel, which is in the shape of a cone surmounted by a hemisphere, has a stopper at the top and a tap at the bottom.\n\nTo use the funnel, the two liquids (one containing the mixture in solution) would be poured in through the top with the tap closed. The funnel is shaken, inverted and the tap carefully opened to release any excess pressure, then allowed to settle. Then the tap can be opened to allow the more dense liquid to be transferred to another vessel. The user must be careful to close the tap exactly when all of the more dense liquid has evacuated the funnel. This requires a certain amount of skill. The remaining liquid can then be transferred to wherever it is needed.