Atmospheric pressure at sea level is _______?
Correct answer: B. 760 mm
- A. 746 mm
- B. 760 mm
- C. 820 mm
- D. None of these
Explanation
Standard atmospheric pressure at mean sea level is 760 mm of mercury, equivalent to one atmosphere or about 101.3 kilopascals. The value changes with altitude and weather, but 760 mm is the standard reference.
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Environmental science covers ecosystems, food chains and webs, energy flow, biogeochemical cycles, biodiversity, natural resources and population effects. Atmospheric study includes the layers and composition of air, weather and climate, greenhouse gases, global warming, ozone depletion, acid rain and pollution, with climate change distinguished from ordinary weather variation.
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