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Why the hot air above the burning candle rises and colder air flows to replace it?
Wiki User
∙ 9y ago
The air is hotter above the flame because the carbon dioxide being generated by the flame is moving up due to convection, which states that hot air rises. An easier way to think of it is that smoke from a fire goes up, not sideways (unless the wind is blowing) so there is hot air above the flame, not beside it.
Wiki User
∙ 16y ago
Wiki User
∙ 9y agoBecause of convection.
Convection is when particles move from a hotter region to a colder region, and it only happens in liquids and gases.
Convection cant happen in solids because the particles cant more- they just vibrate on the spot.
When you heat up a liquid or gas, the particles move faster because they have more kinetic energy (movement energy), and the fluid (liquid or gas) expands, becoming less dense. The warmer, less dense fluid (liquid or gas) rises above the cold, and as the hot air goes up, the cold air comes down to replace it.
So the candle heats up the air surrounding it, making it hotter and less dense, so it rises while the cold air goes down. And then the candle heats up the cold air, and the process continues.
Sources: GCSE OCR Gateway Physics Revision Guide, Higher
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How does the air above a burning candle feel?
The air above a burning candle can feel warmer than the surrounding air due to the heat generated by the flame. It may also feel slightly different in terms of air quality, as the burning process releases smoke, soot, and other combustion byproducts.
Why if your hand is held high above a burning candle does it feel heat?
Air near the flame is heated and rises, thus reaching your hand. This is heat transfer by convection.
What happens to your hand when you place it above a lighted candle?
it gets warm
What temperature is colder 600C or -100C?
-100 degrees c is colder because it's below 0 degrees c. 600 derees c is above.
What is meant by absolute zero of temperature?
It is the coldest temperature. Nothing is colder than absolute zero. Scientists do know what happens in absolute zero because to get it to absolute zero, they have to put the object in something colder. But like mentioned above, nothing is colder than absolute zero. It is pretty much the end of the thermometer.
How does the air above a burning candle feel?
The air above a burning candle can feel warmer than the surrounding air due to the heat generated by the flame. It may also feel slightly different in terms of air quality, as the burning process releases smoke, soot, and other combustion byproducts.
Why if your hand is held high above a burning candle does it feel heat?
Air near the flame is heated and rises, thus reaching your hand. This is heat transfer by convection.
What happen when air gets heated?
As air (unconfined), is heated its volume increases, and its density decreases. That makes it lighter (per volume) than it was. Warm air will rise above colder air, and in essence, float on top of the colder air.
Why does a candle smoke when it's blown out but not while it's burning?
you may not see it but once you blow out the candle, small embers are still inside the wick of the candle and burning. because the embers are so small thriving off the air particles thus creating the smoke you see.Additional answerIt does smoke while burning, if you look closely enough. In fact, if you put a piece of glass or tin above the flame it will become blackened with smoke particles (carbon).
Why is it hotter if you put your hand above a lighted candle than at the sides if the candle's flame?
Yes it is - since heat rises.
How do you prove that hot air rises?
Hot air is less dense (lighter) than colder air, so warmer air will naturally rise above the cooler air.
What burns fastest a thick fat candle or a thiner candle?
The thickness of the wick mostly determines the burn rate. The rate, as used above, is the speed with which the candle wax is consumed, not the rate that the candle burns downward.
What one is colder Celsius or Fahrenheit?
Above -40 degrees, any number in Fahrenheit is colder than the same number in Celsius.
What happens to your hand when you place it above a lighted candle?
it gets warm
What temperature is colder 600C or -100C?
-100 degrees c is colder because it's below 0 degrees c. 600 derees c is above.
Why burning of candle is a physical and chemical change?
CHEMICAL
Would a candle burning at high altitudes burn dimmer brighter or essentially the same as the same candle burning at low altitudes?
Essentially the same. Unless you go to the top of mount Everest where oxygen is scarce. The atmosphere has 21% oxygen by volume, as you go up in altitude the air expands in volume and "thins out", however at sea level a candle needs only 12-15% oxygen content in air to burn brightly. This amount increases as you go up in altitude because there is less air, the air pressure needs to be reduced by 50-60% for this to affect the candle's combustion, or brightness. That corresponds to an altitude of about 7500 meters (4.7 miles) above sea level, or somewhere in the Himalayas.
