Why is dry air used when describing atmospheric gaseous composition?
Answer and explanation
Correct answer: Because water vapour is highly variable.
The amount of water vapour changes greatly with temperature, location, altitude and weather. If it were included in a single fixed percentage, comparisons among the more permanent gases would become confusing. Scientists therefore often describe dry air after excluding water vapour, allowing nitrogen, oxygen, argon and other gases to be compared consistently. Oxygen is still present, so option A is correct.
Frequently asked questions
What is the correct answer to this question?
Because water vapour is highly variable.
Why is this the correct answer?
The amount of water vapour changes greatly with temperature, location, altitude and weather. If it were included in a single fixed percentage, comparisons among the more permanent gases would become confusing. Scientists therefore often describe dry air after excluding water vapour, allowing nitrogen, oxygen, argon and other gases to be compared consistently. Oxygen is still present, so option A is correct.
Which subject and chapter does this question cover?
This is a Class 11 Accountancy question. Chapter: Bank Reconciliation Statement. Topic: Reconciling cash book and passbook differences.
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