How to Calculate Gas Concentration in a Chamber Without Sensors?

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Discussion Overview

The discussion revolves around calculating gas concentration in a closed chamber without using sensors, specifically focusing on a mixture of ammonia and either CO2 or O2. Participants explore theoretical approaches to determine the concentration over time, considering factors such as flow rates and potential chemical reactions.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant asks how to calculate the concentration of ammonia and CO2 in a chamber filled with a known gas mixture.
  • Another participant requests clarification on the setup and suggests that if the chamber is flushed with a known mixture, the concentration should reflect that unless reactions occur.
  • A different participant proposes a scenario where the chamber is fed with a gas stream containing 10% ammonia and 90% CO2, questioning how to express the concentration as a function of time given an initial different concentration.
  • One participant specifies that the chamber is evacuated and has a pressure of 10-3 torr, and asks how to find the concentration of ammonia after a certain time with a constant flow of a gas mixture containing ammonia and O2.
  • Another participant points out the inconsistency in the gas mixture, questioning whether it is CO2 or O2, noting that reactions could affect concentration calculations.
  • A participant suggests finding reaction rates and simulating the process in small time steps, mentioning that temperature may also influence reaction rates.
  • It is noted that if no reactions occur, the concentration inside the chamber would remain at the same ratio as the inflow gas mixture.

Areas of Agreement / Disagreement

Participants express differing views on the gas mixture components (CO2 vs. O2) and the implications of potential chemical reactions, indicating that the discussion remains unresolved with multiple competing perspectives on how to approach the calculation.

Contextual Notes

There are limitations regarding the assumptions about the initial gas concentration, the effects of potential reactions, and the specific conditions under which the calculations are to be made. The discussion does not resolve these complexities.

Who May Find This Useful

This discussion may be useful for individuals interested in gas dynamics, chemical engineering, or experimental physics, particularly those exploring theoretical calculations of gas concentrations in closed systems.

Kaleem Ullah
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How can we find the gas concentration in a chamber without using a sensor i mean by calculation
suppose a mixture of gas ammonia 10% and CO2 90% flow to the gas chamber how we can find that concentration of gas in the chamber?
 
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10% and 90%?

Can you explain the setup in more detail? I don't understand what the question is. If you flush your chamber with a known gas mixture long enough then you probably have this gas mixture inside, unless you get some chemical reactions or something else changing it.
 
I'm trying to read your mind, because you obviously didn't explain what is happening very well. So, here is my guess. You have a chamber being fed with a gas stream containing 10% ammonia and 90% CO2. The rate of flow into the chamber is equal to the rate of flow out of the chamber. The initial concentration of the gas inside the chamber is different from 10%/90%. What is the concentration of the gases in the chamber as a function of time? Is this what you are asking?

Chet
 
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we want to calculate the gas concentration in the closed chamber and chamber is evacuated by rottery pump
and pressure in the chamber (Volume=1023cm3 )is 10-3 torr. now we leave a gas mixture having ammonia NH3 10%
and O2 90% with a constant flow rate towards the chamber... now after a several time how can we find out the gas concentration(e.g ammonia) in the chamber?
 
Wait, CO2 (first post) or O2 (second post)?

With O2, it can react, then the concentration will depend on various details of the setup.
 
Chestermiller said:
I'm trying to read your mind, because you obviously didn't explain what is happening very well. So, here is my guess. You have a chamber being fed with a gas stream containing 10% ammonia and 90% CO2. The rate of flow into the chamber is equal to the rate of flow out of the chamber. The initial concentration of the gas inside the chamber is different from 10%/90%. What is the concentration of the gases in the chamber as a function of time? Is this what you are asking?

Chet
we want to calculate the gas concentration in the closed chamber and chamber is evacuated .
and pressure in the chamber (Volume=1023cm3 )is 10-3 torr. now we leave a gas mixture having ammonia NH3 10%
and O2 90% with a constant flow rate towards the chamber... now after a several time (e.g 5 mint) how can we find out the gas concentration(e.g ammonia) in the chamber?
 
Find the reaction rates (if they are relevant) and the rate of gas inflow, simulate the process in small time steps. Think about the temperature as it will be relevant for the reaction rate.

If no reaction happens, then the amount of gas inside is simply the amount of gas you let in, with the same 90%/10% distribution.
 

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