Answer: The substances which vaporize during burning give flames. For example combustion of kerosene oil produces flame. On the other hand certain substances like coal do not vaporize and hence doesn't produce a flame.
What fuel burns without a flame?
Name one fuel that burns without producing a flame. Charcoal burns without producing flame.
Do all fuels burn with flame?
All the gases which undergoes combustion produces flame. But only those solids and liquid fuels which vaporise on being heated,burn with the flame. Some of the substances which burn by producing flames are LPG, CNG, biogas, wax, camphor, magnesium, kerosene oil, mustard oil.
Why does coal burn without a flame?
Coal does not produce flame when burnt because it does not vapourizes, only those substances which vapourizes on burning produce flame like wax , natural gas. Substances that undergoes rapid combustion have lower ignition temp..and coal do not vaporize while burning that's why does not produce flame.
Is burning possible without flame?
Yes , burning of a substance is possible without a flame. The substances which vaporize during burning give flames. For example :- Combustion of kerosene oil produces flame. On the other hand substances like coal do not vaporize and hence doesn't produce a flame.
38 related questions foundCan you have a fire without oxygen?
Air is made-up of about 21% oxygen, 78% nitrogen and less than 1% other gases including carbon dioxide and water vapor. Fire only needs about 16% oxygen to burn. Without oxygen, fires won't burn.
What is burning without oxygen called?
Pyrolysis, which is also the first step in gasification and combustion, occurs in the absence or near absence of oxygen, and it is thus distinct from combustion (burning), which can take place only if sufficient oxygen is present.
Does candle form flame?
Candles produce light by releasing heat and all the turn on the candle produces come from a chemical reaction known as combustion in which wax reacts with oxygen in the air to produce carbon dioxide. The substances that vaporize while burning produces the flame.
Why do green leaves not catch fire easily?
The green leaves have chlorophyll and moisture will be present in them. This moisture does not allow them to catch fire easily when a heap of green leaves are burnt. However, dry leaves have no moisture or water content in them. Therefore, the heap of dry leaves catch fire easily.
Why coal and petroleum are called fossil fuels?
Over millions of years, heat and pressure from Earth's crust decomposed these organisms into one of the three main kinds of fuel: oil (also called petroleum), natural gas, or coal. These fuels are called fossil fuels, since they are formed from the remains of dead animals and plants.
How do solid fuels burn?
Solid fuel combustion comprises drying, evolution and burning of volatiles, and solid phase combustion. Biochar combustion will produce, by fragmentation and melting, relatively large particles (micrometres to millimetres), which will form bottom ash and fly ash (approximately 1 to 200 μm).
Why does Petrol catch fire more easily than kerosene?
Why does petrol catch fire more easily than kerosene? Answer: Petrol catches fire more easily because its ignition temperature is lower than kerosene. Petrol catches fire with very small amount of heat.
Why does a heap of dry leaves catch fire with a candle flame but not a heap of fresh leaves?
It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain. Ans. The green leaves contain some water due to which the ignition temperature of leaves increases and they do not catch fire easily while dry leaves have no water, so they catch fire easily.
How does pouring water extinguish a fire?
How does pouring water extinguish a fire? Water lowers the temperature of the burning substance. When the temperature goes down below the ignition temperature of the burning substance the fire extinguishes. The water here acts as a cooling agent.
What is a non luminous flame?
A blue colored flame which produces very little light is called non-luminous flame. In other words when a fuel undergoes complete combustion it is non luminous flame.
Why did the flame disappear?
Carbon dioxide molecules are heavier than air. Because of this, they push the oxygen and other molecules in the air out of the way as they sink down over the flame and candle. When oxygen is pushed away from the wick, it can't react with the wax anymore. This makes the flame go out.
Why do you think the flame died when the candle was covered with the jar?
Candle burning requires oxygen and that is present in the air naturally. When we close the candle with jar, then oxygen flow is limited and once all the oxygen present is exhausted the candle gets extinguished.
Can there be a fire in space?
Fires can't start in space itself because there is no oxygen – or indeed anything else – in a vacuum. Yet inside the confines of spacecraft, and freed from gravity, flames behave in strange and beautiful ways. They burn at cooler temperatures, in unfamiliar shapes and are powered by unusual chemistry.
Why does the sun not burn out?
The sun does not run out of oxygen for the simple fact that it does not use oxygen to burn. The burning of the sun is not chemical combustion. It is nuclear fusion.
Where does the sun get its fuel?
Transcript. Nuclear fusion is what happens in the Sun – it's the combining of light elements into heavier elements to produce energy. The Sun produces a large amount of energy by combining very light elements such as hydrogen to heavier elements such as helium and then lithium, oxygen, carbon, right up to iron.
Is 100 pure oxygen flammable?
Answer 1: Oxygen alone won't combust without a spark. Think about it -- ambulances and hospitals often carry around canisters of 100% oxygen, and they are usually just fine. But they do have to be careful about keeping sparks away -- the "no smoking" signs in hospitals aren't just for preventing lung cancer.
What is the hottest fire in the world?
The hottest flame ever produced was at 4990° Celsius. This fire was formed using dicyanoacetylene as fuel and ozone as the oxidizer. Cool fire may also be made. For example, a flame around 120° Celsius may be formed using a regulated air-fuel mixture.
Does sun have oxygen?
The sun, like the rest of the universe, is made mostly of hydrogen. There isn't enough oxygen in the entire solar system to keep the surface of the sun burning through chemical combustion for more than a very short time—probably hours. Instead, the sun's heat and light comes from thermonuclear fusion.
Which of these fuel burns without flame is smokeless and have higher heat generation efficiency?
Statement 2: Charcoal burns without flames, is comparatively smokeless and has higher heat generation.
Why does it is difficult to burn a heap of green leaves but not the dry leaves?
It is difficult to burn a heap of green leaves but dry leaves catch fire easily. Explain. Green leaves have water in them. Water in the green leaves protects the leaves from reaching its ignition temperature, so it makes burning of green leaves difficult.
