Chemistry Gases BUMHS 2023
PMDC Verified Question 28 of 65
Air at sea level is dense. This is practical application of.
A
Boyle's law
B
Charle's law
C
Avogadro's law
D
Dalton's law
Tap any option to test your recall and reveal the step-by-step Propolis autopsy.

Propolis Cognitive Error Autopsy

Official Correct Choice:
Option A: Boyle's law
Concept:

The density of a gas is directly related to how tightly its molecules are packed together, which is governed by pressure and volume relationships.

Solution:

  • At sea level, the column of air above the Earth is at its maximum height, exerting the maximum atmospheric pressure.


  • According to Boyle's Law, volume is inversely proportional to pressure (\( V \propto \frac{1}{P} \)).


  • Because the pressure at sea level is very high, the volume that a given mass of air occupies is compressed and minimized.


  • Density is mass divided by volume (\( d = \frac{m}{V} \)). A smaller, compressed volume results in a higher density. Therefore, Boyle's law directly explains why air at sea level is denser than at higher altitudes.


Why other options are incorrect:

  • Option B: Charles's law deals with temperature variations, not the physical compression due to atmospheric weight.
  • Option C: Avogadro's law relates volume to the number of moles.
  • Option D: Dalton's law relates to partial pressures of non-reacting mixtures.

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