If the fire is contained within the beaker, then you simply need to cover the top of the beaker with anything that will seal it off and allow the fire to extinguish itself due to lack of oxygen.
This depends on type of the fire, where the fire occurred, materials involved etc. and also on your definition for "small".
Depending on these situations you can use the adequate fire extinguisher.
water?
Fire is not extinguished by one element, but by the compound that is water. Individually, the two elements (hydrogen and oxygen) wwould make a fire worse- but the compound of them will exclude oxygen from the fire, and rapidly cool fires below the "kindling" temperature- so it goes out.
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The smoke that is released when a candle is extinguished is white and is a liquid or solid wax. It is produced from the condensation of the wax vapors.
The fire will be extinguished. The better test for identifying carbon dioxide is to bubble the gas into lime water. Limewater will go cloudy because of chalk/limestone precipitation.
Grease Fires!
An Extinguished fire is put out and a raging fire is continuing to burn .
"Extinguished" is a verb in past participle form. It is used to describe the act of putting out a fire or ending a fire's ability to burn.
A wildfire that Forrest crews are watching and letting burn. A natural Forrest fire paves way for new growth.
Nancy poured baking soda on the grease fire to extinguish the flame.
Fire needs oxygen to burn and when the tumbler covers the fire it uses up all the oxygen in the little space quickly and is extinguished.
water?
The fireman was exhausted after extinguishing the fire. or By the time the firemen reached the burning building, the heaven sent rain was already in the process of extinguishing the fire.
It suffoctaes the fire by depriving the fire of air which it needs to burn.
In "To Build a Fire," the second fire is extinguished when the man tries to ignite a match to start a fire after falling into the freezing water. The wet conditions prevent the fire from lighting, causing the man to lose his last chance to warm himself and survive in the harsh wilderness.
Of course.
They will reenter the building when the microwave fire is extinguished.