Which substances do not produce flame?

The chemical process in which a suubstance reacts with oxygen to give off heat is called combustion. The substances which vapourize 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 does not produce a flame.

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Thereof, does petrol produce flame while burning?

The materials, such as wood, coke, LPG (liquid petroleum gas), petrol, diesel, natural gas have one property [n common, i.e., they produce heat on burning which is then put into different uses. For example, a candle or coal gas on burning produces a flame, but not the coal or charcoal. You can also ask which one does not form of flame? For example, kerosene oil and molten wax rise through the wick and are vapourised during burning and form flames. Charcoal, on the other hand, does not vapourise and so does not produce a flame.

In respect to this, do candles make your ceiling black?

Candles can actually leave gray, soot deposits on surfaces, according to Bob Schacke with Home Inspection Experts . You might notice it on the ceiling, walls, or around picture frames. "The jug limits air flow to the flame and this inhibits combustion, causing extra soot." Why is my candle flame so small? There are many potential reasons for this: - When the surface of the wax is almost entirely liquid, the flames sometimes shrink for 1 to 2 hours before the level of the candle evens out. - When there is only a few cm of wax left in your candle, less air can access the flame.

Moreover, what are smokeless candles?

There is described a smokeless candle which contains insect or Chinese wax, in addition to paraffin wax, to prevent generation of soot, when burning flame of the candle flares. Thereof, why is my candle sooting? When your candle is lit, the candle flame melts the wax next to the wick, and the melted liquid wax is drawn up through the wick by the flame. If the wick is too long, or if there is a small daft, the heat-to-fuel ratio will be off, resulting in incomplete combustion and causing excessive black soot as a consequence.