Candles go out when you cup the flame because in order for something to burn it requires oxygen. And in any combustion reaction Oxygen is needed. So when the oxygen is used up in the glass. The chemical reaction can no longer occur.
When an inverted beaker is placed over a lit candle, the flame goes out due to lack of oxygen. As the candle burns, it consumes oxygen and generates carbon dioxide and water vapor. When the beaker is placed over the candle, it creates a closed system, limiting the supply of oxygen needed for combustion, causing the flame to extinguish.
"All the darkness in the world cannot extinguish the light of a single candle." (Saint Francis of Assisi). 'I put out the candle to extinguish the light in my room. Light flooded through the windows into my room. It was then that I knew how much light was there out in the world as moon light. My puny candle was preventing all this light from coming into my room.' (Rabindranath Tagore).
The candle will cease to burn because oxygen is needed for burning. This is why one of the ways to extinguish a flame is to remove its source of oxygen, as described in the fire triangle.
A burning candle goes off when covered by a glass cup because it uses up the available oxygen in the cup, creating a sealed environment with no oxygen for the flame to continue burning. This causes the flame to extinguish due to the lack of oxygen needed for combustion.
The most effective way to extinguish the flame of a candle is to use a candle snuffer.People returned to churches all over the land and kindled flames of revival that are still burning todayThe candle's flame was flickering in the soft breeze
Putting salt on a burning candle can help extinguish the flame by cutting off the oxygen supply. The salt melts and can create a crust over the wick, preventing it from burning. However, adding salt can also generate some smoke and may produce a foul smell.
You do not give us the conditions when the candle stops burning, but a guess would be that the candle is in a closed container. When the candle has used up the oxygen inside the closed container, it can no longer burn, and goes out.
Lifting the glass tumbler placed over a burning candle to a height of 1cm could disrupt the airflow around the candle, affecting its ability to receive oxygen. This may cause the candle flame to flicker, decrease in size, or even extinguish depending on how much air is allowed to reach the flame.
Naturally, it is Carbon Dioxide because it is denser than oxygen which is a gas needed for combustion.
The fast moving air blown at the candle reduces the heat available, which removes an essential element of the fire triangle, causing the flame to extinguish.
Placing a candle under a glass container will cause the flame to consume the oxygen inside the container. As the oxygen is used up, the flame will eventually extinguish due to lack of oxygen, creating a vacuum inside the container.
If a candle is alight, the wick will burn and release heat and light through the process of combustion. The wax will melt and be drawn up the wick to fuel the flame. It is important to monitor the candle to ensure safe burning conditions and to extinguish it properly when not in use.