Discussion
Which property makes water unique among atmospheric constituents?
Answer: B
The triple point of water lies at 0.01 degrees Celsius and 6.11 hectopascals, squarely within the atmospheric range, so all three phases coexist and the transitions between them carry latent heat. No other atmospheric substance behaves this way. Water is also the strongest greenhouse gas, so the fourth option is emphatically wrong, and it makes up under 4 per cent of the air at most. Checking the units of each quantity catches a wrong formula before the arithmetic begins.
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