Tillie Doyle
Bunsen burners are commonly used in laboratories for heating, sterilization, and combustion. They can reach temperatures of up to 1500°C and are used to heat high-boiling liquids with low flammability, such as water. While Bunsen burners are useful for various laboratory processes, it is important to consider safety precautions when using them. They should not be used with highly flammable solvents. When using a Bunsen burner, it is crucial to ensure the proper setup to prevent the ignition of organic vapors. The burner is typically placed beneath a laboratory tripod that holds a beaker or another container. The blue flame of a properly lit Bunsen burner indicates complete combustion and is hotter than an orange flame, which results from incomplete combustion.
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What You'll Learn
Safety
A Bunsen burner is a type of ambient air gas burner used as laboratory equipment. It produces a single open flame and is used for heating, sterilisation, and combustion. The gas used can be natural gas or liquefied petroleum gas, such as propane or butane. The combustion temperature depends on the adiabatic flame temperature of the chosen fuel mixture.
When using a Bunsen burner, safety precautions must be followed to prevent accidents and injuries. Here are some essential safety guidelines to adhere to:
- Use proper ventilation: Bunsen burners release gases and fumes during combustion. Ensure that the room is adequately ventilated to prevent the buildup of harmful gases and reduce the risk of fire.
- Wear appropriate safety gear: Protect yourself by wearing safety goggles to shield your eyes from potential sparks or hot substances, and heat-resistant gloves to safeguard your hands when handling hot equipment.
- Use a heatproof mat: Place the Bunsen burner on a heatproof mat to protect the underlying surface from heat damage and to prevent the burner from directly contacting flammable materials.
- Maintain a safe distance: Keep a safe distance from the burner when in use to reduce the risk of burns or exposure to harmful fumes. Ensure that long hair, clothing, and flammable materials are also kept away from the open flame.
- Handle flammable materials with caution: Flammable liquids and gases should be handled and stored securely, following safety protocols. Always use the appropriate amount of fuel to avoid overfilling and minimise the risk of spills or leaks.
- Monitor the flame carefully: Keep a close eye on the flame during use. If the flame appears abnormal, such as having a yellow or orange tint, adjust the air intake or fuel mixture to restore a stable blue flame.
- Avoid direct contact with a hot burner: Do not touch or handle the burner immediately after use, as it will be extremely hot. Allow it to cool down completely before handling or storing it.
- Practice fire safety: Keep a fire extinguisher or a fire blanket nearby in case of a fire. Ensure you know how to operate the fire safety equipment properly. Familiarise yourself with emergency procedures and exit routes in the event of a fire or accident.
By following these safety guidelines and staying vigilant, you can help ensure a safe working environment when using a Bunsen burner. It is crucial to always prioritise safety and seek proper training before operating any laboratory equipment, including Bunsen burners.
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$13.49
Setup
To set up a Bunsen burner for use with a steam pan, you will need to follow these steps:
Firstly, ensure you have a suitable workspace. Bunsen burners are typically used in laboratories and placed on a heatproof mat to protect the surface of the bench. You will also need a laboratory tripod to support the steam pan above the burner. The tripod should be placed securely on the mat, with the Bunsen burner underneath.
Next, you need to prepare the Bunsen burner. The burner uses either natural gas (mainly methane) or liquefied petroleum gas such as propane or butane. Ensure the gas source is connected to the burner and that the gas flow can be controlled. The Bunsen burner operates by mixing gas with air in a controlled fashion before combustion, resulting in a hot, sootless, and non-luminous flame. Adjust the air intake at the bottom of the burner to control the flame.
Once the burner is set up, you can place the steam pan on the tripod above the flame. The pan should be made of a material that can withstand high temperatures, such as borosilicate, to avoid cracking or warping. Ensure the pan is securely positioned and will not tip over.
Before igniting the burner, ensure adequate ventilation in the room to prevent the buildup of hazardous gases. Also, ensure that any flammable materials are well away from the burner to prevent accidents.
Finally, ignite the burner. Adjust the gas flow and air intake to achieve the desired flame temperature and size. The Bunsen burner should provide a stable and controlled heat source for your steam pan. Always monitor the setup while in use and exercise caution when working with an open flame.
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Flame types
A Bunsen burner is a type of ambient air gas burner commonly used in laboratories for heating, sterilisation, and combustion. It is named after Robert Bunsen, who first used coal gas as fuel for the burner. The two primary fuel sources for a Bunsen burner are natural gas (mostly methane) and liquefied petroleum gas (propane, butane, or a mixture of the two).
The flame type of a Bunsen burner depends on the amount of oxygen in the mixture, which can be controlled by adjusting the bottom-mounted valve or air inlet. When the air hole is completely closed, a safety flame or safe flame is produced, which reaches temperatures of around 300 degrees Celsius. This flame is easy to notice in a well-lit space. As the air hole is opened slightly, a reddish flame appears, indicating partial combustion. A purple flame is produced when the air hole is partially opened, demonstrating half combustion power. When the air hole is fully opened, a blue flame appears, which is the hottest setting, reaching temperatures of 500 to 700 degrees Celsius. This flame is nearly invisible against some backgrounds and can be hazardous.
It is important to note that a Bunsen burner is a fire hazard and should be handled with care. Proper safety precautions, such as tying back long hair, avoiding loose clothing and jewellery, and using a heat-resistant surface, must be followed when using a Bunsen burner. Additionally, the burner should never be left unattended, even on the safety flame setting.
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Alternatives
While Bunsen burners are commonly used in labs, there are several alternatives that can be considered, especially if the space is not adequately set up for lab work. Here are some alternatives to Bunsen burners that can be used for heating:
Hot Plates
Hot plates are a popular alternative to Bunsen burners and are considered safe and convenient. They are commonly used in classrooms and laboratories. However, it is important to note that using multiple hot plates simultaneously may trip the breaker, so it is advisable to check the electrical capacity before opting for this alternative.
Alcohol Burners
Alcohol burners, such as those available from Flinn's website, are inexpensive and easy to use. They are fuelled by ethyl alcohol and provide a flame source for heating. However, it is important to prioritise safety measures when working with an open flame.
Portable Bunsen Burners
Portable Bunsen burners, such as the FIREBOY plus, offer a modern and safe alternative to traditional Bunsen burners. They are compact, easy to use, and can be operated with various gases like propane, butane, natural gas, or town gas. The FIREBOY plus features advanced safety measures, including a non-touch sensor ignition, temperature protection, a flame monitor, and an alarm display.
Tea Lights or Candles
For smaller-scale heating requirements, tea lights or candles can be a simple and accessible alternative. They provide a flame source without the need for specialised equipment.
Heating Mantles
Heating mantles are commonly used in organic chemistry labs and offer a specialised heating option. However, they typically require more specialised glassware, so this alternative may be more suitable for advanced laboratories with the necessary equipment.
DIY Kerosene Burner
A simple DIY kerosene burner can be created by using a small metal lid jar with a cotton wick threaded through a hole in the lid. This option should be handled with care, similar to a Molotov cocktail, but can provide a basic heating source.
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Uses
A Bunsen burner is a type of ambient air gas burner used as laboratory equipment. It is used for heating, sterilisation, and combustion. The burner is placed underneath a laboratory tripod, which supports a beaker or another container. The burner is often placed on a heatproof mat to protect the surface of the laboratory bench.
Bunsen burners are used in microbiology laboratories to sterilise equipment and produce an updraft that forces airborne contaminants away from the working area. The gas used in a Bunsen burner can be natural gas (mainly methane) or a liquefied petroleum gas, such as propane or butane. The combustion temperature achieved depends on the adiabatic flame temperature of the chosen fuel mixture.
Bunsen burners can be used for steam distillation. In the past, a Bunsen flame was applied directly to a flask for heating purposes and even used for vacuum distillation. However, it is recommended to use a bath or a mantle to heat borosilicate round-bottom flasks, as direct contact with a stove can cause cracking.
The Bunsen burner was invented by Robert Bunsen, who sought to improve existing laboratory burner lamps in terms of economy, simplicity, and flame temperature, adapting them to coal-gas fuel. The Bunsen burner design generates a hot, sootless, non-luminous flame by mixing gas with air in a controlled fashion before combustion.
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Frequently asked questions
A Bunsen burner is a type of ambient air gas burner used as laboratory equipment. It produces a single open flame and is used for heating, sterilisation, and combustion.
Yes, historically a Bunsen burner was used to directly heat a pan for steam distillation.
The Teclu burner and the Meker burner are both alternatives to the Bunsen burner. The Teclu burner provides better mixing of air and fuel and can achieve higher flame temperatures. The Meker burner has a wider tube with more openings, allowing for better mixing of air and gas.
The burner is usually placed on a heatproof mat to protect the surface of the laboratory bench. It is important to slowly heat glassware to avoid cracking and to avoid adding cold water to hot glass.
