Limiting oxygen concentration

High school (ages 12+)
Safety & Emergency

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/limiting-oxygen-concentration

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the environmental dependencies?Significantly influenced by ambient pressure and temperature
2. What is the engineering application?Basis for purging procedures and hypoxic air fire prevention systems
3. What is the Limiting Oxygen Concentration (LOC)?The LOC is the lowest amount of oxygen, measured in percent, that can keep a fire going for a particular fuel. It shows how much oxygen is needed for combustion.
4. Why does the LOC change with temperature and pressure?When the air is hotter, some fuels need less oxygen to burn, so the LOC goes down. When the air is under more pressure, more oxygen is needed, so the LOC goes up.

Combustion: A rapid chemical process involving oxidation that produces heat and light.
Inert Gas: A gas that exhibits negligible chemical reactivity under specific conditions, used for displacement.
Thermal Ballast: A substance that absorbs heat energy, thereby reducing the temperature of its surroundings.
Hypoxic Air System: A fire prevention system that reduces oxygen concentration below the LOC to inhibit combustion.