Question 1 of 270705eccef9ebacbc34ba4d465a0

The explosive range of a mixture of flammable vapors and air lies between the lower and upper explosive limits. These limits are specified as a percentage of __________.

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Question 1 of 27070
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The explosive range of a mixture of flammable vapors and air lies between the lower and upper explosive limits. These limits are specified as a percentage of __________.

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🔍 Key Concepts

• Explosive (flammable) limits are defined by concentration of fuel in air • Difference between oxygen concentration and fuel vapor concentration in combustion • How "percent" is usually expressed for gas mixtures (think: by volume in air)

💭 Think About

• Ask yourself: When we say a mixture is too "lean" or too "rich" to burn, what exactly is there too little or too much of? • In tank atmosphere testing, what are you actually measuring with an explosimeter or gas detector when you read a % of the lower explosive limit? • Which choices describe something that is normally measured as a percent of the gas mixture inside a space, not a property of the liquid itself?

✅ Before You Answer

• Make sure the percentage refers to the composition of the gas mixture, not a property of the liquid cargo like flash point • Eliminate any options that are not expressed as a percent of the total gas volume in a space • Check which answer focuses on the amount of fuel vapor in air, rather than on oxygen alone or on the definition using itself (circular definition)