Thermodynamics - Burning Butane in an Oven

• Astrum
In summary: This would result in a significantly hotter flame and would not be allowed to happen in a normal oven. However, because the environment temperature is also increasing, the products of the reaction will eventually outnumber the reactants and the flame will go out.
Astrum
You have a butane torch and an oven.

Two scenarios:

1. Butane is burning in an oven heated to 200 C, does the burning point of the butane change at all?

2. Butane is burning in an oven heated to 2000 C, does the butane have a cooling effect on the oven?

The burning point of butane is 1950 C in air.

In the first situation, the ambient temperature is sure to increase, and I assume that the burning temperature of the butane will increase, simply because the surrounding air will not have as much of an effect on the butane.

In the second scenario, I haven't the slightest clue.

Astrum said:
You have a butane torch and an oven.

Two scenarios:

1. Butane is burning in an oven heated to 200 C, does the burning point of the butane change at all?

2. Butane is burning in an oven heated to 2000 C, does the butane have a cooling effect on the oven?

The burning point of butane is 1950 C in air.

In the first situation, the ambient temperature is sure to increase, and I assume that the burning temperature of the butane will increase, simply because the surrounding air will not have as much of an effect on the butane.

In the second scenario, I haven't the slightest clue.

Shouldn't this depend on what temp. the butane came in at?

Whether the heat of combustion at 2000 C is less or more than the heat capacity of the gas?

Burning the butane is exothermic and will never have a cooling effect. It will simply make the oven hotter. The burning temperature given is only valid for standard atmospheric conditions. http://en.wikipedia.org/wiki/Gas_burner

I suppose burning in a hotter environment will make the flame hotter.

Khashishi said:
Burning the butane is exothermic and will never have a cooling effect. It will simply make the oven hotter. The burning temperature given is only valid for standard atmospheric conditions. http://en.wikipedia.org/wiki/Gas_burner

I suppose burning in a hotter environment will make the flame hotter.

Aren't you neglecting the cooling effect of specific heat? Cold butane into a hot oven cools.

Is the exothermicity large enough to compensate?

rollingstein said:
Aren't you neglecting the cooling effect of specific heat? Cold butane into a hot oven cools.

Is the exothermicity large enough to compensate?

The combustion energy is 2.89 MJ/mol.

specific heat of Butane is 98.5 J/(K mol), so heating it by 1725 K takes 0.170 MJ/mol.

willem2 said:
The combustion energy is 2.89 MJ/mol.

specific heat of Butane is 98.5 J/(K mol), so heating it by 1725 K takes 0.170 MJ/mol.

Thanks! Clearly, no cooling effect.

The process is reactants ==> burning == products.
As stated the the adiabatic flame temperature and heat of combustion cna be stated for a standard atmosphere.
If the environment temperature increases, not all of the products will be formed ie perhaps CO instead of C02 will continue to be one of the species if the oven temperature is great enough. This will affect the flame temperature and and how much heat can be obtained from the reaction. It is not a linear relationship with temperature.
A certain oven temperature can be reached where the reactants will break apart into their constituent parts and no products are formed but continue to persist as a plasma.

1. What is thermodynamics?

Thermodynamics is the branch of physics that studies the transfer of energy and its relationship with temperature, heat, and work.

2. How does burning butane in an oven relate to thermodynamics?

Burning butane in an oven involves the transfer of energy from the butane molecules to the surrounding air. This transfer of energy is governed by the principles of thermodynamics.

3. How does the oven temperature affect the burning of butane?

The oven temperature directly affects the rate of combustion of butane. A higher temperature will increase the rate of combustion, while a lower temperature will decrease it.

4. What is the role of oxygen in the burning of butane in an oven?

Oxygen is necessary for the burning of butane as it acts as an oxidizing agent. It combines with the butane molecules to release energy in the form of heat and light.

5. Can the burning of butane in an oven violate the laws of thermodynamics?

No, the burning of butane in an oven follows the laws of thermodynamics. Energy cannot be created or destroyed, only transferred from one form to another. The heat and light energy released during the burning process are a result of this energy transfer.

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