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the black deposit must be on porcelain because of luminous flame which spread the hot coal or black deposit on white ceramic material.

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sittie asiah macapan...

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โˆ™ 2021-09-30 12:56:42
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โˆ™ 2012-09-26 22:16:26

because it i9s make from porcelain

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Q: Why the evaporating dish turn black under luminous flame?
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Why does a flame go out under a glass jar?

A flame uses oxygen as its fuel, so once all the oxygen in the jar has been burned the flame will die.


Why is the blue flame hotter than yellow flame?

A blue flame is hotter than a yellow flame because a blue flame has more oxygen, so it has more energy to create extra heat. Therefore, a blue flame is more dangerous and a yellow flame is used in laboratories. The hottest part of the blue flame is right under the middle, this part is called the crown !!


When a candle is put under a tumbler why its flame goes after some times?

When a candle is put under a tumbler , the flame goes after somtimes . This is all because all the oxygen present in the tumbler has been used for burning.


What is the black residue on the test tube when heated with a luminous flame?

Usually, the more luminous or yellow a flame, the less efficient the burn process is. This can be compared to a properly adjusted gas stove. The flame is fully blue with no yellow, and minimal luminosity. When a flame is yellow (assuming typical fuels of things like candles, alcohol, and NG, etc.), it indicates incomplete combustion. Natural gas (NG) is very clean burning, but requires the proper amount of oxygen (air) in order to do so. This is why, for example, to properly adjust a gas furnace. Properly adjusted, the flame is all blue. Improperly adjusted, or clogged air inlets cause the flame to turn yellow. A dangerous side effect of incomplete combustion is the production of CO or carbon monoxide. This is carbon "without enough oxygen". Blue flames have enough oxygen and produce CO2 (and water), or carbon <u>dioxide</u> which is much less dangerous to life then CO. When something like a test tube is placed in the flame, the much cooler glass condenses and catches the product of incomplete combustion - carbon. So the black coating is basically all carbon. Usually this coating will wash off easily on smooth lab glassware. To prevent it from occurring, the flame source needs more oxygen, i.e. more air and possibly a cleaner fuel source. This requires an apparatus other than a plain wick (as in a Bunsen burner) and includes holes under the flame area to draw in enough air to fully burn the fuel. Also some fuels are not clean burning as in paraffin or candles. other fuels like natural gas, or propane can easily be made to burn clean with a fully blue flame. This would have close to zero carbon content and would not turn the test tube black. Examples of a clean blue flame would be again, a gas stove, and a propane torch, which uses the propane flow from a jet, to draw in air before it reaches the flame. This results in the typical light, to dark blue flame and is very clean.


What is the flame front speed of gasoline?

I have read ( via the Internet) the flame front for gasoline is 40 to 50 cm / sec. My questions are ... 1) under what CR ? 2) for what octanes ? 3) Under what loading parameters ? -Ted Hart

Related questions

Under what condition would a flame become luminous and non luminous?

it is non luminous when a stronger light it being shed on it


What will happen to the underside of a dish after heating it under a luminous flame?

it becomes brownish or black due to the soot produce by the flame during heating. thus the underside of the dish will be brownish or black and even some sort of dusty...


Can you hold a balloon under a flame without popping it?

UNDER a flame? Sure, why not? Over a flame? Close? Uhhh... NO


Why the under side of the cooking is made black and the side are shiny?

The black bottom is a reaction of residual fumes from the flame, combined with the heat reaction of the metal. This isn't a dangerous sign at all.


What is water evaporating?

Evaporation is the transformation of a liquid in a gas at a temperature under the boiling temperature.


What degree is a white flame?

There is no specific degree that creates a white flame. However, it is considered a very hot flame, just under blue, which is known as the hottest flame.


Is JFK buried under the eternal flame?

Yes


Why does a flame go out under a glass jar?

A flame uses oxygen as its fuel, so once all the oxygen in the jar has been burned the flame will die.


Barium chloride flame test?

The result of flame testing batium under a Bunsen burner is a apple green


Does a candle with flame have cells?

Not really. The candle would have molecules, but the flame falls under energy and would break down to quanta.


What does a cool flame indicate on a Bunsen burner?

That the flame is still 400 degrees and you should not touch it


Why is the blue flame hotter than yellow flame?

A blue flame is hotter than a yellow flame because a blue flame has more oxygen, so it has more energy to create extra heat. Therefore, a blue flame is more dangerous and a yellow flame is used in laboratories. The hottest part of the blue flame is right under the middle, this part is called the crown !!

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