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Bunsen burners are preferred over candles or fires because the Bunsen burner produces a much higher temperature (noted by the blue flame) and it is much easier to contain/control a Bunsen Burner flame.
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To keep it from tipping over while in use.
It is called a griebon (pronounced jreeborn) or a tripod
Wire gauze can be used to support a container (such as a beaker or flask) during heating. When the Bunsen burner flame is beneath it, with a tripod, the wire gauze helps to spread the flame (and heat) out evenly over the container. It is frequently used in combination with an iron ring and ring stand with a Bunsen burner underneath it (see the Related Questions for more information about an iron ring, ring stand, and Bunsen burner & tripod). A clay triangle serves a similar purpose, except that a clay triangle is used for a crucible instead.
a tripod is put over the bunsen burner
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gauze mat
It absorbes energy as heat.
When heating a substance over a Bunsen burner the iron clamp for test tubes or the wire gauze is placed on top of the iron ring for beakers.
This is to reduce the chances of the burner accidentally tipping over. Knocking over a lit Bunsen burner could obviously have very bad results.
over a blue flame
typically undergoes heating and may undergo a phase change or chemical reaction depending on its properties. The Bunsen burner provides a consistent and controlled source of heat to increase the temperature of the substance, allowing for various processes such as evaporation, combustion, or decomposition to occur.
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This serves to spread out the point of application of the heat.
The base of a Bunsen burner allows it to remain stable while standing.
tripod and gauze Matt