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There are 2 reasons for using high pressure oxygen in bomb calorimeter. The 1st is that we need enough oxygen for a complete combustion in a very small volume. To do that the oxidant pressure must be high. The typical air ratios in a bomb calorimeter are between 4 and 9.
The 2nd reason is that we want to measure the high calorific value of a fuel. Thus the water produced from the combustion must be in liquid form. For a certain temperature, the higher the vapor pressure, the higher the liquid water percentage. So, the higher the total pressure (25 atm), the higher the partial vapor pressure.
jimmer
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What is oxygen bomb calorimeter?
An oxygen bomb calorimeter is a device used to measure the energy content of a sample by combusting it in a controlled environment and measuring the temperature change. The sample is sealed in a high-pressure vessel (the bomb) with oxygen, ignited, and the heat released is used to calculate the calorific value of the sample. This method is commonly used to determine the energy content of fuels and food.
What are the differences between simple calorimeter and bomb calorimeter?
A simple calorimeter measures heat changes in a substance through temperature changes in water surrounding it, while a bomb calorimeter measures the heat of combustion of a substance by igniting it in a sealed chamber under high pressure. Bomb calorimeters are more precise and accurate than simple calorimeters, but they are also more complex and expensive to operate.
What is principle of working of bomb calorimeter?
A bomb calorimeter is a type of constant-volume calorimeter used in measuring the heat of combustion of a particular reaction. Bomb calorimeters have to withstand the large pressure within the calorimeter as the reaction is being measured. Electrical energy is used to ignite the fuel; as the fuel is burning, it will heat up the surrounding air, which expands and escapes through a tube that leads the air out of the calorimeter. When the air is escaping through the copper tube it will also heat up the water outside the tube. The temperature of the water allows for calculating calorie content of the fuel
Is a bomb calorimeter accurate?
Yes, a bomb calorimeter is known for its high accuracy in measuring heat of combustion for various substances. It can provide precise measurements by keeping the system isolated and accounting for all heat transfer mechanisms.
What is disadvantages of bomb calorimeter?
Some disadvantages of bomb calorimeters include their high cost, the required specialized training to operate them properly, and the limited range of samples that can be analyzed. Additionally, bomb calorimeters are typically slow to use compared to other analytical methods.
What is oxygen bomb calorimeter?
An oxygen bomb calorimeter is a device used to measure the energy content of a sample by combusting it in a controlled environment and measuring the temperature change. The sample is sealed in a high-pressure vessel (the bomb) with oxygen, ignited, and the heat released is used to calculate the calorific value of the sample. This method is commonly used to determine the energy content of fuels and food.
What are the differences between simple calorimeter and bomb calorimeter?
A simple calorimeter measures heat changes in a substance through temperature changes in water surrounding it, while a bomb calorimeter measures the heat of combustion of a substance by igniting it in a sealed chamber under high pressure. Bomb calorimeters are more precise and accurate than simple calorimeters, but they are also more complex and expensive to operate.
What is the difference between a bomb calorimeter and a coffee cup calorimeter?
A bomb calorimeter is a sealed device used to measure the heat of combustion of a substance under constant volume, typically in a controlled environment, allowing for high-pressure reactions. In contrast, a coffee cup calorimeter is an open system that measures heat changes in reactions occurring at constant pressure, making it suitable for simpler experiments like neutralization or dissolution in aqueous solutions. The bomb calorimeter is designed for high-energy reactions, while the coffee cup calorimeter is more suited for less intense reactions.
What is principle of working of bomb calorimeter?
A bomb calorimeter is a type of constant-volume calorimeter used in measuring the heat of combustion of a particular reaction. Bomb calorimeters have to withstand the large pressure within the calorimeter as the reaction is being measured. Electrical energy is used to ignite the fuel; as the fuel is burning, it will heat up the surrounding air, which expands and escapes through a tube that leads the air out of the calorimeter. When the air is escaping through the copper tube it will also heat up the water outside the tube. The temperature of the water allows for calculating calorie content of the fuel
Why bomb calorimeter is called by that name?
In conducting a calorimetric test using a bomb calorimeter, the substance or object to be studied is placed inside the combustion crucible and ignited. The resulting reaction usually occurs so quickly that it resembles the explosion of a bomb-hence, the name "bomb calorimeter."
Is a bomb calorimeter accurate?
Yes, a bomb calorimeter is known for its high accuracy in measuring heat of combustion for various substances. It can provide precise measurements by keeping the system isolated and accounting for all heat transfer mechanisms.
What is disadvantages of bomb calorimeter?
Some disadvantages of bomb calorimeters include their high cost, the required specialized training to operate them properly, and the limited range of samples that can be analyzed. Additionally, bomb calorimeters are typically slow to use compared to other analytical methods.
Why the pressure of oxygen becomes low at high altitudes?
At higher altitudes, the air pressure decreases because the air molecules are more spread out. This reduction in pressure means there are fewer oxygen molecules available in the air to be breathed in, leading to lower oxygen levels at high altitudes.
Why does the level of oxygen decreases on high mountain?
The level of oxygen decreases on high mountains because the air pressure decreases as altitude increases. This decrease in air pressure results in lower oxygen content for each breath taken at high elevations, making it harder for the body to get enough oxygen.
How would gas exchange be affected at the top of a tall mountain where air pressure is lower and there is less oxygen then at lower elevations?
At high altitudes, atmospheric pressure is lower. Therefore, the partial pressure (partial oxygen) is lower. As partial pressure of oxygen goes down, the body's desire for oxygen goes up.
How would gas exchange be affected at the top of a tall mountain where air pressure is lower and there is less oxygen then lower elevations?
At high altitudes, atmospheric pressure is lower. Therefore, the partial pressure (partial oxygen) is lower. As partial pressure of oxygen goes down, the body's desire for oxygen goes up.
Why you can not make an oxygen bomb?
If I'm understanding your question, the answer is that oxygen doesn't burn, it just helps other things to burn. There are things called 'fuel-air' bombs that take advantage of oxygen's ability to increase explosive potential.
